Malicious PDF — malware analysis report

Static analysis result for SHA-256 930c442734bf191f…

MALICIOUS

PDF

101.2 KB Created: 2021-07-04 08:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c4a411740c8ad2072f64fe7e16da1c24 SHA-1: 117d0f642e9eac49fba73daf87112e6af4274ce7 SHA-256: 930c442734bf191fc26727b8efa9831fd3c532c479bb8f9c7d2960b9fbd42ff3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various websites, some of which appear to be compromised. The primary purpose seems to be redirecting users to malicious content through a chain of linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/cfc1904de08995176221a13cdb64fbe0/pirajiragetodasak.pdf In PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/071da3823662f9d8c49c881890c194e4/33663296411.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/64494424013.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210626022934593752rj29e1gwlx3c.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b1335792532---suwovowagepafozomonupu.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/fakalapugavi.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/84eab620556e27f54451ebf4b968a330/dozuzeni.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/f6e447383ac6f1473e94f425b4685bb6/wimofigamejimujozonif.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/94451351373.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/furazorutidukurodapexoko.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/mujfngks5bkp1a5457voaomauv/rabopafotokusazawile.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a746130cb4e---modifojigujajupaxasufe.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/ledapokuvakewoxim.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/minoxafafafitojejoku.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/73543101310.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/bifeluxobapaweninekita.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/maxediwevuzad.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/mukezuledug.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898ee1076f9---5808370100.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/2ra8ibmu2codea9pj38p7p0tht/88000363442.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c3063c9e56d---65930759128.pdfIn PDF document text
    • https://anfauglir.com/images/file/17081637498.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c77fa32a0e---bowomidenexazogupamatal.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/o0eav8pch13hl826f78cm6onh0/tetenekexixitofikuxajunet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=history+notes+for+ba+llb+1st+semesterPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00010658.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10658 18948 bytes
SHA-256: d0ac81249f449a4c92c218773d86ccfde07ef29404b8021bb47a8f6f7c7b6812
font_01_sfnt_off00012426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12426 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C38 19240 bytes
SHA-256: c4788cc6fda624cd72f16e1658599eaae94e148213ef11cc3ed7c4a9a100c5b2
font_03_sfnt_off00016e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E17 10672 bytes
SHA-256: 2e7ff7fe9e19d72d90a6169d9e0ca2b76dcc948dda10da34c177aee7cbcef0e8

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