Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac2801cbd0c61dc…

MALICIOUS

PDF

83.7 KB Created: 2021-08-05 01:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8cbc0b1b519b555cc2ebed376d2a970b SHA-1: 5fec44507c58a184826712a6a2caace54e657dbd SHA-256: 9ac2801cbd0c61dca3d411983c9ed07ab60e35b2fda193d4348c2a464f926822
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, likely intended to redirect users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing or malware distribution tactics. No scripts were extracted, and the document body was unreadable, but the presence of many URLs and the heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=spider+solitaire+win+7+free+download PDF link annotation
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/c07cc4f0cba53c0949ee27b061cd4646/71131646686.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/9c89b930bf77681e8b810f3c43b6f0ee/dowifevovifak.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e952216465f---17183648423.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/89778757891.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/097e738c8baaaab73f4d54f2af066f93/83671102153.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16097d139efd7e---42103414810.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/2946176792.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/62446842854.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942f60499fa---javobawiwumomitib.pdfIn PDF document text
    • https://dm288.rs/slicice/file/74168034822.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/14759543351.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/52161155672.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/fiketukefibere.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/sotatolelikojuwufafed.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/4u35d4i1228cg23rdduo3bmnlp/zuvedabisib.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3fd4541fa7930552db6a9a560188a32f/18250076401.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad199938e74---67262901689.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/41803957358.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/51932079600.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3b898e879---sufojabu.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607d03d0ec566---zataluzemefiguwe.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760a2962572---87489644959.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d48d2415667---kivubojenadonozapinev.pdfIn PDF document text
    • https://biocoils.com/img/file/73563627641.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/povelifelulifisamutof.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_off0000e3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C1 17096 bytes
SHA-256: 0fffdc0c1a7d9495fff36b0f601c8e9b9c62d0b8c261e81cdc4b6b0a37d5c88c
font_01_sfnt_off00011060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11060 10700 bytes
SHA-256: 24e5c4b24c2090b010959a9129ea7b64d5c154b50b8c49b0261e163f79c9de61
font_02_sfnt_off00012924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12924 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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