Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbbddc13dad4678…

MALICIOUS

PDF

84.8 KB Created: 2021-08-11 21:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8af3eaaf47f4658e18360e675209f33f SHA-1: 28366b65726f551a67bfaa6617cb00b19b95057e SHA-256: 3fbbddc13dad4678cf1a85f9c460301f35d92ecc56c31d26bc335e539e784c1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://high-keenltd.com/userfiles/file/wipanowaw.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2f40511e2---vukovinozaz.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/51320550429.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/kupurakajanize.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/26f7670edac825a2c0986f47952967a4/78592948327.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf69a2e66---23515437321.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/betumage.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/fariboredumidu.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/91471441934.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/zonolatipaselanuf.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0377af257---20726088634.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/lofolonapelagipozivexiduw.pdfIn PDF document text
    • https://arerp.kr/data/file///kapapapawapozozeluv.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dfec89dc0c3---jikowol.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/vofawuzasodifedanedumi.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/sedatuledisumokukaji.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4797755f9---rifonumegi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/lagufepozonumulunu.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/xevebolapupuwebijageva.pdfIn PDF document text
    • https://onwater.my/uploads/file/95890726491.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/622fa1662257369a46457dd2af913abc/pimumugiw.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5e466a3ec---41435335262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+use+estee+lauder+double+wear+stay+in+place+makeupPDF 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_off0000e5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A8 11196 bytes
SHA-256: 4ac4cb3f61cbefd6235a6eefdd669fd25ab2d522ae62637e984544c74e938c4e
font_01_sfnt_off0000ffa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA9 17332 bytes
SHA-256: aaf91db80242825c9c5ce70274ad6f1663ca1dafd02e9bccaf7084a4ed4ad958
font_02_sfnt_off00012d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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