Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c89a8b5d19f323e…

MALICIOUS

PDF

75.4 KB Created: 2021-06-11 07:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: bb86b66ffaf6bb2bca619b3d215f16fe SHA-1: 8c411bc9ae35bb96d26a6ef5c17671574ec9f792 SHA-256: 3c89a8b5d19f323e077be76c0f0a9f10b82c6fdbfb44ec597dcf067afbef40fc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF document contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to host malicious content. Heuristics indicate a 'Clipboard command execution lure' and a 'ClickFix social engineering attack', instructing the user to copy and paste commands into a terminal. This indicates an attempt to bypass security measures and execute arbitrary commands on the victim's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

Heuristics 7

  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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=ie+temp+files+location PDF link annotation
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92c6fd2f5a---muweluwuxisufetubagera.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/7539453778d2ba7bb1398f2aaa9bb41e/59046261839.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/29a59b007c8f12a9bea2752e9d39ebf7/7678750018.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/gezasufedejezasafuxegij.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a177b5db445---73786335850.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/74585193525.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082575b795fa---28870173966.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079725601d30---nateletiguri.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a43848869---kaxetixufi.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/cvgel59573oh0350dvd7ch28r1/80064323114.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704871a5694---kawufogotat.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/47beff338f525513502afaadd700b760/zititezokin.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/6689a9dcac18a3c7d100b2e13c18995c/91754131282.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b0909dc30---64259128186.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 5000 bytes
SHA-256: 0a87f5acbd1fea5eefde842c34f54700ce73c75a1f9b21ae8848ac27fbbabd2f
font_01_sfnt_off000102d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D5 10968 bytes
SHA-256: ea370b63243192d953425c33a2281e6ecad2eb4a19734e3a37fd12af49fc777a

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