Malicious PDF — malware analysis report

Static analysis result for SHA-256 f137bfd9b10412c2…

MALICIOUS

PDF

87.6 KB Created: 2021-09-17 22:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e988e3d5df2bbec862d4c4805a029ba6 SHA-1: 7a1aab44e87198cda7e87ecea36a1ba234f2aae1 SHA-256: f137bfd9b10412c23bba3189c2a879273d3557fa0edbd72bdbc1b4ca0e051ca5
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a credential phishing lure. It impersonates Outlook and directs users to a suspicious URL, likely to harvest login details. The presence of numerous links to potentially compromised websites and disposable hosting further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crysiq.ru/uplcv?utm_term=att+email+setup+on+android.
  • 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.
  • 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 https://crysiq.ru/uplcv?utm_term=att+email+setup+on+android PDF link annotation
    • http://engcaphone.com/_UploadFile/Images/file/pupodezalolexonapofotelit.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/damutefejojoxezija.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/nixapuzodaj.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/42797503530.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/55202456898.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/89bac1c421e76b32400821cf51b30a1f/20887063994.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/68762584582.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/6844702624.pdfIn PDF document text
    • https://hotelcorona.ro/files/74076130244.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345c4187bf0---97787530576.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/ripisavas.pdfIn PDF document text
    • http://kalikraft.com/images/file/39404692418.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0387bdd35---lekulezaxaxuferujenavoz.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/xegowakusu.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210917175838.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/83684056275.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/zomemudovugalok.pdfIn PDF document text
    • https://sadex.pl/fck/file/fujedavegedoluxopiduma.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/57891233275.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/sirararekuzafigafofedef.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/8f902f035a10e214385d032c998f38a8/55702770644.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613da25f43801---50177747103.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/senijatezakisofimijud.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/65192661566.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161302f5d6a91e---pijuxinirodopedug.pdfIn PDF document text
    • 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_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 10636 bytes
SHA-256: 8410e1fcf22fa7c598dafe60f267bd0c818b7944c123026054bfff3f00029220
font_01_sfnt_off0001064f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E61 19384 bytes
SHA-256: d2644bba04d5c75317fd8fd9c785f44883840b9299cd8286ea868b1f1f3bdb9a

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