Malicious PDF — malware analysis report

Static analysis result for SHA-256 10eebba86d52111a…

MALICIOUS

PDF

85.7 KB Created: 2021-09-07 16:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 481dc7f191da756cf6b8b960f441e146 SHA-1: 4aaf8369123846efbf3c38fa1496b3fe1535af49 SHA-256: 10eebba86d52111aa7d8be8b3ae9bfda78ae76d255266a799542167a328d212a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely serving as a lure to download further malicious payloads or redirect to phishing sites. No scripts were extracted, but the presence of external URIs and compromised CMS links strongly suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=text+to+pdf+in+java PDF link annotation
    • http://temple.mo/userfiles/file/zuxuxa.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/3248e6790ba9470ce163e42989f8958c/rebononupugiwo.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/gukamelemevepijiz.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/mrae3ntn1s8k1pqc1qr71p8a8s/25521118585.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/brion0ov8qtl3mc06bp0eotuje/59032535254.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/1900756206edaa692988a2173809e870/10504591847.pdfIn PDF document text
    • https://ntc-container.com/upload/files/belegeribabuwo.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/bizizewob.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/puzubekonufele.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3ad2bdccf0b2f5947f4824f7e3ed5b7e/69412020931.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/21654474592.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/44821397584.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/moturexukejigigowigapi.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/17647033096.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/65339832884.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/90375098806.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c790fce609---3112757712.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/pututusupuna.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/suleboj.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/psneaqhe05tkfbqb8a14ls7h0i/13840603563.pdfIn PDF document text
    • https://atl-50.com/files/file/safigoxow.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/vurizovejama.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/sarinugivogapetojofilo.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/7744cc60f94d21cbdaf78ec3ca42277d/tikifugixevajubopo.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/04e289710ff8e863a2d0ebb5f2bbefe8/86935842315.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/b7q5v3uigvk46997j6jvt8hs0o/resar.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_off0000eb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 17656 bytes
SHA-256: fac16c26002818bec3282ee11cfaca6fba822f0d4631ca74afa2a79cb253f0f4
font_01_sfnt_off00011937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11937 10436 bytes
SHA-256: fc983ad3bd2670b88b57861356b0d74b887e3794cc02cda7f7dcc7df96352460
font_02_sfnt_off00013104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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