Malicious PDF — malware analysis report

Static analysis result for SHA-256 36eaf84e54253205…

MALICIOUS

PDF

83.5 KB Created: 2021-08-13 07:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 667bbcf5304fae8e963c85379583b0cf SHA-1: ef5d4f5fc4950016b593a976c653fdeb8cae372f SHA-256: 36eaf84e5425320577859700f4b0cf8d60f061c6097101238da9111273431ce9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/uplcv?utm_term=how+to+get+free+keys+farmville+2 PDF link annotation
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/56941922028.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/70110327821.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/o2qi92foqj9nqjpvhcviu540k1/posowuwaturutipakanezamu.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/25199549410.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a08f9234fc---majikalukopikifodumuf.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/b70fd7c48a26244fb1bcf25623680ab8/votadovufepawewima.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06c94f39bc---xifunefe.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/f3b5fb9901dda67e924a48b85be94446/79863249999.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/34051507930.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/49465536151.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/70902353f8362a6be527ae6bb31c1d34/zifejozunesozojo.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/98655882860.pdfIn PDF document text
    • https://paperland.bg/uploads/file/32201558519.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/ml9qfcrlek1kmk8lp15ogeofoi/68070550745.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/galobudisanot.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/gagelugawifutipe.pdfIn PDF document text
    • http://viorina-deko.com/images/file/72916014675.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6a215ad90dfdc22bce27ecbb5f67f235/bokaxalilumi.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/12277395562.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/ac4ac43192fadfef2d12319d6e789609/35431280385.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/tixavipuvasir.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/dqi9ot7i859q45o1hsg0ke74r0/3174058065.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3bc755a5e---dexubajud.pdfIn PDF document text
    • https://blugarden.eu/file/30374498857.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_off0000e0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CC 17156 bytes
SHA-256: 3c74b0d2b81f7a6278eb263ed2881addb9d295664ce94d17931c0c161eb96569
font_01_sfnt_off00010dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBD 10920 bytes
SHA-256: d0d7ba21b175a3bcc99bef89fc0d0544c0c2b19b2aad1399f552fc0ea674ad66
font_02_sfnt_off00012730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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