Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9cb8fd211c7b84…

MALICIOUS

PDF

84.8 KB Created: 2021-09-15 04:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9685cd5192d886f63b930cdad2092c70 SHA-1: 54ebee67f73880d036e7852e6d82313ae39f99ca SHA-256: 5c9cb8fd211c7b849266fe2d1eea42e7ff5424ad8fd59c25b199e5a90d858041
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to redirect users to malicious sites. The presence of embedded URLs further supports this attack pattern.

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://drafthe.ru/uplcv?utm_term=ml+free+diamonds+no+verification PDF link annotation
    • http://rgn2u.com/userfiles/files/65478497598.pdfIn PDF document text
    • https://123natura.com/stockages/files/zufirezewid.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/geladupudepe.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/10273690502.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/86723592216.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ecd08e3ce---36776849473.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/50582672730.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/17900921115.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/61354999851.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ea990cabe---93933792675.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/gagumajotunalure.pdfIn PDF document text
    • http://simonide.org/userfiles/file/89496531263.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210909_2D3896F37D46F095.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/kabidizewokuziworamuzuwu.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614119fac157b---vipowazegamogufetu.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/22014446387.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/nikit.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/nizenisonu.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/xajeresenog.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/96711647718.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/17212117999.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/fodubigazaxegel.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/52199026545.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/745ee7fbd1165cde1e463ed22e1397c5/vunavalubival.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/qd4kk0ll649h9hcbujo4hqkmce/89091198229.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/10141647720.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_off0000e516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE516 18336 bytes
SHA-256: 90aa715806ae4d46a69052c1dac0e34eca609007f2f1e262ede751a1fb906a8b
font_01_sfnt_off00011499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB0 10696 bytes
SHA-256: 0cbf711c80db928260044761352b5b4e3508a7f83822286cd62e9cee5bfd2fb9

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