Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb22dfc1e25321a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-23 19:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac84c30008d60ce581bffd85eea0d00f SHA-1: b9e1c43903a5eb257dbf734294ea82fd33d3b26a SHA-256: afb22dfc1e25321a886ef43a6b9575134f7856ee78a8403195ed33710c05332d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating phishing and trojan characteristics. It contains numerous URLs, including a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure and embedded URLs are consistent with phishing lures, likely aiming to harvest credentials or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=movies123+free+website PDF link annotation
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/sebogonepotitutijoxafav.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614559e37ca5e---namogepazodomevarowewumi.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/38015063332.pdfIn PDF document text
    • http://salespate.com/userfiles/file/xosalo.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/bozagikojiwok.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/wegiserizofiwag.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/gojujozekopilisixikoga.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/mumumugokuvite.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/7838807143.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/22785817146.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/porivateroz.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/jelimagofiliderorovis.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/44295058115.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/41f668b185a34d0bb73bd0c43ff277ed/81919150407.pdfIn PDF document text
    • http://koala-al.com/d/files/97057600887.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/6d383caf5fea23a27d6b4ba650e2418e/wixisabuwasutanaz.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/vigewubusanelituwa.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/74128439432.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/panudotenakumubafotiwa.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210917200327_973129676.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/zififilewumelusukaf.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/12011433150.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/66923727824.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021091221345377.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f43fd5b370---35514430215.pdfIn PDF document text
    • https://polandpools.com/contents/files/51947940266.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/kajifawulekojugenib.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_off0000e3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B7 10524 bytes
SHA-256: 761e1d4ed0d8440cf0f96214cc9e89b96fc3a1e3122382bc86c1648fc0d48251
font_01_sfnt_off0000fc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001142e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142E 17100 bytes
SHA-256: bbe8e9ea1c04dc44a1cf7b51f41b3328a6bc6c746e870fcc0c96d44e00330025

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