Malicious PDF — malware analysis report

Static analysis result for SHA-256 747859efbfa537fb…

MALICIOUS

PDF

67.7 KB Created: 2021-09-06 06:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd73f2777a0e7ab63c6b1b74d622e1a2 SHA-1: eb79e489956b583b6368caf3211a4b0256dde910 SHA-256: 747859efbfa537fbe9f793d664498ea010fda6c553d6b14350ae509d154bdb14
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to lead users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7257

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607802c2a349d---92944627221.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1gf5jbu7au866e8v8e0ud004a7/joguditebufoxi.pdf
    • http://dailymaydemtien.com/userfiles/files/vexagajutadafakelovuxizu.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a4ad07c5ef23f52ea7474ecb5cfbb057/26171269540.pdf
    • http://clarksville.net/wysiwygfiles/file/50885217751.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/434349f5f87e52b2b8b6d1502d9bc37f/10213730915.pdf
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/66044480745.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c6d80d8b76f0b2e7bd32ce70c0a2c2c1/18321975295.pdf
    • http://timavoshipsupply.it/userfiles/file/67485450287.pdf
    • http://strap.sk/uploads/file/jisoteto.pdf
    • http://qianshunqs.com/admin/upload/47578068280.pdf
    • http://bjhtdszdh.com/v15/Upload/file/202181812122060.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/d2c0877badd3abdb26fd9bdb6482180a/22232907903.pdf
    • http://automsystem.com/UploadFile/file/20210817234533719.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081f3d1c3e43---rebilopuzixutivetazi.pdf
    • http://retco.ge/ckfinder/userfiles/files/8973056632.pdf
    • http://wf515345.tw/CKEdit/upload/files/99120040589.pdf
    • http://maydemtienvn.com/upload/files/84859503262.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3e9973ed7---32741485502.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/8bbcc042938ca05ade8d19cea32babdb/tepobiretixolan.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/5421a40c1a0182a541c2ab993ce3bbeb/lubexifovuwanugab.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=historia+de+la+iglesia+catolica+edad+antigua+pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1ab.bin
c4e05c3b13267f38fac9cd121980d2642d2ae9a63d360e56b73830a7ae71160b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AB 10888 bytes
font_01_sfnt_off0000cab4.bin
b722b99191fde98bd01e27e4cbe7e9a49ead2d786fee2cc1b53b958e502175b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB4 16080 bytes
font_02_sfnt_off0000f2e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 16792 bytes