Malicious PDF — malware analysis report

Static analysis result for SHA-256 8044566e2911d3cc…

MALICIOUS

PDF

80.3 KB Created: 2021-06-13 08:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 10b61a8eb17b18dda463d1309108b777 SHA-1: 8af50e76c89faa3ff02a7155a8edf21c8899c5a3 SHA-256: 8044566e2911d3cc329b4a6bf6219236aebaddb96d1db81be1a5fd440c8d7e5b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised WordPress sites, specifically pointing to PDF files hosted on upload directories. The heuristic PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM indicate these links are likely part of a link farm designed to redirect users to malicious content. The embedded document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be a generated document used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=borderlands+3+moze+leveling+guide PDF link annotation
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ed57294d1---kovikore.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/933d25a0344be8fd4d7b88716d79daa9/jibabedaluga.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743662c3903---61220036117.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c56e5c821d---verapu.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/8d91634bacfa03d14dc8a53682c5cc69/fituxesasar.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/90b538a66faface734afb78c3d0ef2f1/63060898573.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3a6bc8d8---vukufenorovereb.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/5tbqg7hnasu1n8dvk97ef6vrgj/1726678168.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/25207876169.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160adfad9e8094---luzafozo.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c38d5a6bc2f---89840224351.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/107193800.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098074aaf63c---kofimaginevozeruvifunosop.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/tibijufivotu.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/3bf299e7b7f0df9741e1a50cea455b45/lebitebenuxete.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/sorasevexosu.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e8c00f966245477b14dd277daca2240a/86749358237.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 5272 bytes
SHA-256: ac288ef6a93a48da8e01fa35303bde06b4a498a0e8fd8a2f3ba9eab2466bd0a8
font_01_sfnt_off0001016f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 10684 bytes
SHA-256: 7d8211cca91d57ddfc33bb22b2fc1787ed5a7f3236068c091c42c6e14a31ffbe
font_02_sfnt_off00012616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12616 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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