Malicious PDF — malware analysis report

Static analysis result for SHA-256 30815597e2b72ba1…

MALICIOUS

PDF

76.2 KB Created: 2021-09-16 11:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5ab1450935e13c27ba490daed26e64d9 SHA-1: 346f608b0c03e623c06656ed575397f28ddf4361 SHA-256: 30815597e2b72ba14704db49bd52c42efc1f01480ac86e31878dd1599463c244
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to distribute malicious links via disposable hosting. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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://philabc.ru/uplcv?utm_term=read+breaking+dawn+online+free PDF link annotation
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/mdo8fhap6l51tcv38ss3d484hp/8017089910.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/vufewonujalaziwufofama.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/40198890352.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/fajawavisujesozemamalu.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/64938172719.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/lepam.pdfIn PDF document text
    • http://elma1.ru/!upload/files/kujewuxiga.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/96392789348.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8bea2dc6---xelobowujozamabewevinope.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/ferujexeluvev.pdfIn PDF document text
    • https://12tiga.com/contents/files/puxetezuwafesarimibi.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/31620675326.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161336b8482e34---68984948569.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091614302242.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/43811370096.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142953373744---zamimegasezowotedog.pdfIn PDF document text
    • http://bwc.lt/i/97391303415.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/kemibexaze.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/438952620.pdfIn PDF document text
    • http://dentherapia.hu/files/file/juluxovugulisatokosuket.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210916074329.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/3074806884.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/p4vvmmso3uof4ssj7mkmv0nb17/tekala.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/34341396328.pdfIn PDF document text
    • http://nineslash.com/user_file/file/58663177485.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE7 16828 bytes
SHA-256: cf8ec29467b2e5ffe67b3a7802af7c020423b8a65c84c92198d77b7f9afa43ba
font_02_sfnt_off00010b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0C 10628 bytes
SHA-256: b8f6554e5bdbf50dda06818b76336816e30ac8d897dd59041d926164523c0b90