Malicious PDF — malware analysis report

Static analysis result for SHA-256 7edef85eea2a370b…

MALICIOUS

PDF

77.5 KB Created: 2021-09-14 05:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f06576bfbde898e9e32b90902971fde4 SHA-1: 43b228d9015b1fd4a8bfcffce0fc5463d50b81e1 SHA-256: 7edef85eea2a370b1c1d9e7061d03a4747a75c30f7bfbe5cf927d0b80ee6a59e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Harvest Credentials

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The 'SE_MFA_LURE' heuristic strongly suggests the document is designed to harvest credentials or abuse multi-factor authentication. The presence of numerous external URLs, many hosted on compromised or disposable domains, further supports its role as a phishing lure. No scripts were extracted, but the overall structure and heuristics point to a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://nomylo.ru/uplcv?utm_term=i+movie+app+mod+apk PDF link annotation
    • http://dymenahealthcare.com/upload/fckeditor/file/49532894823.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/sawonuwanokogowixisazawop.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/90250456074.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/R9E3bvXKApZ1.pdfIn PDF document text
    • https://mimpidia.com/contents/files/ruridabuwozozopifuwedegi.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/5fa209db75322ee0f5a521f79bb7993b/17155810903.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/85e9493168dcad2b3ce8f56c9c1a8e27/kibuwatekinanoverikas.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/84377886355.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/40711041046.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090505294168.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a21bb4b115---40072219977.pdfIn PDF document text
    • https://anjingliar.com/contents/files/xinodotitobikisew.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/vunowitagevig.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161305eb4f27fa---48195657510.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/zojopixodo.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/59615530079.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/ziburobowimisidowuku.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/4236377490.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2lo4vilc2f21b2a9vfa2dlqq6d/xatamogisovubifaz.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/sosixujixozipiv.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/kipisosenofolusabipiv.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/63472380029.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_off0000cc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE438 17736 bytes
SHA-256: 8e13ae04540d6ed1383bf63a8e1968fe274ba2c105233d20ee70a681922154b5
font_02_sfnt_off00011230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11230 10148 bytes
SHA-256: 0557773200d79501479302c167dc255f975a4125c2408270f92c44869ebee3ef

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