Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0704d9f26efbafc…

MALICIOUS

PDF

85.8 KB Created: 2021-06-26 21:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 197e9cec0bf73b46b869e15856b92814 SHA-1: abc447df29c4e0d4682e0a4c991eb9527f096096 SHA-256: a0704d9f26efbafc79c52df37b4ee9f6b0d806f1ceaffac0408b6c6c6c8f96ec
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Steal or Forge Credentials

The PDF contains multiple links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' specifically identifies an impersonation of Outlook, with a call-to-action link that does not match the brand. This strongly suggests a credential phishing attempt. The ClamAV detection further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=chinese+new+year+fortune+teller.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b08d67a65db---86143885500.pdf In PDF document text
    • http://turagent007.ru/userfiles/file/5737879142.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/zodesuloj.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a841d7ce36---risuxilor.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/lakajawavurokusaxe.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16098aff739fd8---72693097057.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c489d370437---90419378664.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/sorusejomolunedelaponogiz.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/30646459380.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/wisajirepagegezulorevikax.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608142569e25f---dukerogivodog.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091cf6b11c24---99879900115.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/2k12iq28hgohhbfvhe55doidaq/mizaz.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074309189bee---gubufijelegomiru.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/kadidope.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/wanupokikene.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/447043222f8898a40fa092f703d772f8/sifiwax.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a703eda83be---puposowotagovepexolixub.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/96278a99323706901fdce23f48a82801/33509066972.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c320364ad42---32699956458.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/e1vv18rkfaqrkbfb8q6ns0opt5/31547860809.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/e7si612rflp31do2lsqlj6pec9/peromejujowuxekowulo.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/6d9de8ed100c18c7de911531e8365337/miwiregewojepezubufejedos.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/58384284854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=chinese+new+year+fortune+tellerPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A5 17808 bytes
SHA-256: 5fed477aa8b9b0f58630cf19c981e8852a544a84e645ee0bb3836864fa0f1f0c
font_02_sfnt_off0001314b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314B 10640 bytes
SHA-256: 590e348ef023057a58abc30cd29f731d4b9e174f74baff8a63bc66c97b3871d5

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