Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff4db468b830cac…

MALICIOUS

PDF

83.9 KB Created: 2021-07-09 12:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 31017728c01e14cd123545a84215be1a SHA-1: 20805f302afb4846d1b7817f58da0e48e6eb00e4 SHA-256: 2ff4db468b830cacbb2564f73c4694c02cff8e065cb06e314f2b6426444d8031
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs and heuristics indicate it is a link farm, likely intended to direct users to malicious websites. The 'SE_INVOICE_LURE' heuristic suggests a phishing pretext. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://allytemp.ru/uplcv?utm_term=sample+of+letter+of+explanation+for+canada+study+permit PDF link annotation
    • http://dok-vo.ru/userfiles/file/fuzize.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/8327306085.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/57878067698.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210512033143170.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbe4452d53---35796669530.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/voramodimitesavewi.pdfIn PDF document text
    • http://didopack.com/files/setapal.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5479a9e913---wegizisejirexagusofebulim.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/424d472f3181a319a32cede92c789a54/78391857629.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e197b6694---sajegulerudefipixol.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077c63a35713---diponivurubinurewokedozu.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a8dcbc8e9---86632808080.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/umcrdfd4tthsuekhefbuabjpg7/71939333460.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/vepiretaxaf.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/08ea745f76409f7b8cf03b1beec09ac0/89303281721.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/lixujovapovupo.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/30492772158.pdfIn PDF document text
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/57115170550.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/45f285516c384143b36a69bd4aa359ac/javodotabasosixalurumak.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/6a107871b0c800b2d50bd479d63244c0/94625140009.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/gorofameloz.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6495611bd7---37228539639.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adc0888d8b3---68977228561.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_off0000e406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE406 16812 bytes
SHA-256: 35db98fdb70db73f1fbb91188303e7ebbabeb3c92feb69e00769650208e6d6dd
font_01_sfnt_off00010fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDA 11172 bytes
SHA-256: 2cad4a13f6f7c3a8a4d524ebe3a6e601585abeef27d0a58592891e8e2dc02809
font_02_sfnt_off000129f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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