Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe625955fcf6881…

MALICIOUS

PDF

80.4 KB Created: 2021-06-12 14:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 46eaeaf6c4ee166241667735705a4293 SHA-1: f2a15675222cd348b2a7576803e7576d7377e750 SHA-256: 1fe625955fcf6881f8a31779f19d5680ad534726b4e8bc6212cd0b4820605723
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress upload storage, likely intended to trick users into downloading a malicious file disguised as a game. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing lure for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://coretry.ru/uplcv?utm_term=nba+2k17+game+download PDF link annotation
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/dd634500bbb626ff7012591f7e893883/mubizapujulok.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/sipesasajowukenonavoz.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/c819ha7ag90fnsa8kib3v6tmgd/12701070428.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0919e33491---daxiriwizomomibujana.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/jomugiwi.pdfIn PDF document text
    • https://bursac.net/userfiles/file/galubikurirokowi.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/sse2qa4taf3ce4nqos4apoltgo/10371411437.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/569fb2edd28207dc8621f69721bf1f6b/96267303106.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/aecf4e1852887a437ded2b79cebdd558/60361651964.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/4269e7e1b3a3f61f524bce4f3801471a/nabikejetedulaxamo.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/3378a7ffc3ac60ad7b242d911c56c42a/54200740148.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c454b22f66b---wojufajurorijim.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070e805eb24d---tobubumukidizadapi.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/v8jprs31rskgvna6cuaqilt0rb/kigame.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad53c2cdb7---jalutulopafejufudisijuke.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/32367360569.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/hag4upb56snk64d679ngqvm9j5/91079083059.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://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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000118ce.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x118CE 17408 bytes
SHA-256: 7dffae378f0ba8b81f124838d599791a911662a22654005c3c56651d0746f7e4
font_00_sfnt_off0000e43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43C 5060 bytes
SHA-256: ed8df1bdea62988593cf4e5a16e4768dcb328a45d21a269a712fa71689b7ca50
font_01_sfnt_off0000f57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 10336 bytes
SHA-256: 13cd3ef5c891494b1506525f44546cd6772013fb43eb57a8ab7f0102ea51d9bd
font_03_sfnt_off0001329f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378