Malicious PDF — malware analysis report

Static analysis result for SHA-256 b580960535e634e1…

MALICIOUS

PDF

78.1 KB Created: 2021-09-14 12:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 564586ec82225ed649e7f588d5c768b4 SHA-1: 97028463aaa772e269dc421f7cde93f597a64535 SHA-256: b580960535e634e174734d79be1c817b3f59fe8034083df796a75862dbd9195b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://derfo.info/resimler/files/takebono.pdf In PDF document text
    • http://ltpbetel.ro/userfiles/file/vupeguwifokoginututagan.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/fojenavuxesabojijuvog.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/bifobikaxexox.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/jotudi.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/60436985541.pdfIn PDF document text
    • http://orderkai.com/uploads/files/25123109878.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/0prk12pkbk3o6j50v4o0lciotf/vugamotewiziga.pdfIn PDF document text
    • https://ambalatender.com/upload/files/48116250057.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/wewanifoxidun.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/berugiwipefegitomofix.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/47164845120.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/915394880.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/62790843257.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/70126222226.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/8ba1300c47687f60fbfddc572b598af2/98792804092.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/14538780252.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9d578d36e---fabeze.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/2459e12700d6fa06becdc279c7a32da3/71103822789.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/nalesodatofotumojunijuf.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/xemanejepulovixave.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/bufomudigosejidabaxafusus.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/javidixurenamivopizabom.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/21745758764.pdfIn PDF document text
    • http://hingliltd.com/userfiles/nifubijewigifidufodutib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+how+to+restore+deleted+filesPDF 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_off0000ce51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE51 17440 bytes
SHA-256: 45d322cffe6a582fe392ded9d08c2a77cbe0e0d9c4ca97e03a1c2d7851f70af1
font_01_sfnt_off0000fba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 10356 bytes
SHA-256: 02fb6219b79bbdfb813eabd0d253dc7d7a70f9d845b1c96e5fe06152d5c10f44
font_02_sfnt_off00011307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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