Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0b469ab35d5401…

MALICIOUS

PDF

83.6 KB Created: 2021-09-06 07:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 48a220ab60c7382ec817c47b3457f35f SHA-1: 44efe65406ac508583e294290f3b2e12bb74fb53 SHA-256: 3a0b469ab35d5401836e83c457f9e709dcf511fdfaaadf41fcbe3bf92717c00d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The primary attack pattern involves directing users to external, potentially compromised, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/f91d5017fb518bc1a131bf4697f65ffd/kigebutuzoxal.pdf In PDF document text
    • http://elsekmont.eu/userfiles/file/lipezim.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076846e7c556---ruzexozuzag.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/31032533273.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/r10b26h8npnvanjulip2saq8lg/34747926723.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/16a56bba1a61bf4d60cbfc41774cea5b/lofonaginado.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/bifosemibigid.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962f4df005a---lakabafuvodonivejuk.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/8c1a713377838e8b3feb9e5598f5d66f/68041882681.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/wijaminiretade.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/zibibava.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/e9e3ee1c2f199e315b5f52e3e9490d99/84203138622.pdfIn PDF document text
    • http://huefpdf.org/upload/file/wovomidugogumowaj.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-8-25/20210825124559250308.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210726_E12AF36E91616B70.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/nahk5pa6ri67ehdtf25uc0rt7a/62517799776.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/70125284980.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/vubegakuromemodet.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/kjtv19u88618nt9rqbkd6ubogs/roterixogebewe.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/zaribodawomebo.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/24425904683.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/29803622019.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/ratisogazi.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/newuv.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6aa161c39e---54665118300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=advanced+vocabulary+in+context+donald+watson+pdfPDF 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_off0000d97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97E 19336 bytes
SHA-256: 3b2ba0a801f917b68071dcc2d3207cd13e112cc0f259cfcbbc003ce7b9624a31
font_01_sfnt_off00010bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFC 11204 bytes
SHA-256: 2eddc841de3e4a0ff713a19075fe06ec6771cd84c06469dcc9b77ed4f792cc9c
font_02_sfnt_off00012641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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