Malicious PDF — malware analysis report

Static analysis result for SHA-256 012e053f8a167d5c…

MALICIOUS

PDF

82.5 KB Created: 2021-06-17 08:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0c5bc4f04a543da0b961b90b6d5422b9 SHA-1: ec2131a1ca2f011fa60bb40724ad9081dc548ab8 SHA-256: 012e053f8a167d5c0c9d57d14d71bcdbcb4546cad5d9c033abeac67981f52403
154 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 embedded URLs, many pointing to compromised WordPress uploads, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5325

Heuristics 5

  • 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
  • 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://crysiq.ru/uplcv?utm_term=autocad+block+visibility+states PDF link annotation
    • http://aimic.com/userfiles/file/54326558661.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/gi0nieahltoqrcu3gsusb405df/dupunuwarimoparil.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4111bcc3bd751d7a3f487abeaca8668f/28960661275.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/70fc37a4f0c3c9ee72cf701d35b057e1/70428305289.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/d0069d41ee4aed0c22e7f67ec781145b/81451591278.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/fasewapudinu.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/17321225992.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b058c0a130e1df870d5fec207d1696bb/87474584417.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1rg85jaedq2jnrf77ifkm93eln/74074395942.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acb4f5ca399---gekepivibo.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/vusowujol.pdfIn PDF document text
    • https://bursac.net/userfiles/file/pebubozasimelikixeparutis.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021060414513473499.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/tuvizuv.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/sisonevesubamazubagabeda.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 4968 bytes
SHA-256: abcb142196b04bbf650bc692dba83c556dd5778095d5aa2528f4b576ff98ff5d
font_01_sfnt_off00010d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7E 20456 bytes
SHA-256: 5cd32db06c6c1b7b08c4ccb41310597fc464804bbb60ead0b4e872280601eb06
font_02_sfnt_off00013f6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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