Malicious PDF — malware analysis report

Static analysis result for SHA-256 482e8e1dd983f50b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 15:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 24b594278c6049ee852dbb8a7476183f SHA-1: 8642a6c386259bf2a846ea5f3b2563bb679e0e80 SHA-256: 482e8e1dd983f50b7c9bad2b23c2fcb2cb671463f2791e3312360015190b8713
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Steal or Modify Data

The PDF document contains multiple heuristics indicating it is a phishing lure, specifically impersonating Facebook. It includes a link farm pointing to compromised CMS upload storage and disposable hosting, with one prominent URL leading to a credential phishing attempt. Although no scripts were explicitly extracted, the ML classifier and brand credential phishing heuristic strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=dragon+city+cheat+gems+food+and+gold.
  • 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://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/70eed6ac0620c6daab81d72422614e27/88959535044.pdf In PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139dffcc316c---rinojisesisugenerojava.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/16946929454.pdfIn PDF document text
    • http://konberdbio.com/upload/files/27335593307.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/korebubofidejokobujuse.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/xepojoderidufudigomupu.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210908_AED3A275FFFF73BF.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/kutarowijidubuwadepanefis.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/46601112059.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/firofidadujedof.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/dupebivo.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/niwepove.pdfIn PDF document text
    • http://tzsunup.com/upload/83302648288.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/23749914280.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210911233128.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/37696893113.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109140446292106.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/5817424472.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/xodosuramogop.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613774ff7c988---lebakunabosopat.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142da1aec01c---detaveseneparimotoju.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613190a02a5ba---wejapuzona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=dragon+city+cheat+gems+food+and+goldPDF 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_off0000d82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82E 18836 bytes
SHA-256: 539833c7c0b2d082a026320a9a71af81c124ea3006b78cf95a7c32171c367a1b
font_01_sfnt_off00010882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 11036 bytes
SHA-256: 7f9a75747fce729f9fd32cd145e659be314bafa89efd1dfd23b89ae5643346d7
font_02_sfnt_off000121d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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