Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b43741a4311a9b7…

MALICIOUS

PDF

76.3 KB Created: 2021-06-23 16:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 39bafb5541442a3ce4998a178a54a76b SHA-1: d373b0c2c900e0bd0b9a47326cfbb9bd131ea389 SHA-256: 1b43741a4311a9b7864263566db738792d0cd3a7d7bc767bcb484347fdee4b34
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9291

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://investmentskillsgroup.com/images/userfiles/file/39634538680.pdf In PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc8483987d---vibir.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079d8e675bef---wufixenamu.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/simixedibumemurezo.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/85643456513.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609541b864c8e---bixilegejomolefelab.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/24397835626.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/44705285142.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/0c411945bce00da5611adddd6bf7231c/77338734689.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ikgnnp8vd91os7q5av56j6hq73/womudapalapomosin.pdfIn PDF document text
    • http://abpaluso.com/upload/file/gafawubikepafiru.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7eca4af36---nimilobenajulerisuwijaxod.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/wubibokovemomisazis.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85aa95435b---31964805922.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/40260991922.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083dcdd25c02---jolusipuge.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/jisilemujo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=qatil+e+ishq+novel+pdf+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010527.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10527 25084 bytes
SHA-256: 32f06afbd1587a3dc64a843885d4d320776ba7ae3e602e9c9f2fe07e370194bd
font_00_sfnt_off0000cece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECE 5372 bytes
SHA-256: 41c7d087c2bdb2086a666ca71d60ce1bd67cfdbacae7790915c1fc7197e8fed4
font_01_sfnt_off0000e126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE126 10524 bytes
SHA-256: 1b23542418dcddab44d6521775bdcd8490738b680f72070891621dde4b54500e

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