Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5f018d260c39ef…

MALICIOUS

PDF

88.3 KB Created: 2021-07-01 10:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5743d2daeba891064f6cd7ea06f27835 SHA-1: 113af2abbeec52100d261b691f587207198e05d5 SHA-256: 4b5f018d260c39ef9311bb265926a98fbcd45ddc73e437377e15db3386cb37dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites hosting PDF files. This suggests the document's primary purpose is to act as a link farm, directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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 http://aldara-latinoamerica.com/userfiles/file/30886197644.pdf In PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3628f074e---fudikemupe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef5ef7cedd---xetajelurexikaxud.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd8ca195e6a70866157f3262bfd8ded3/zidewotetunikexukug.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085b4a86dc91---78293983589.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082daf8a0d50---korukolukaginejalufawo.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca81518f78---nomizodijejewine.pdfIn PDF document text
    • https://2acontractor.it/images/file/duwoxinazafo.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/dukimototexibefodedego.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/bozis.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076965641e81---fawudiwot.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6012df218f---sebinasizuzuvu.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/mulex.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/69901241803.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b11c56b9750c180ea6fea6c6a2b46abe/zesulididizobipe.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/11334141390.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/towupabin.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/658f663664cc66ea9099f6f22804a8ff/74864517129.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160927346e339e---3427340007.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b041f7e41ab---10223638971.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab8e66e65b---91591515045.pdfIn PDF document text
    • http://axwelindia.com/uploads/68558139631.pdfIn PDF document text
    • https://isleo.com/i_photos/file/95302279080.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/rufikureregi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+unlock+the+jetsetter+in+mario+kart+wiiPDF link annotation
    • 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_off0000f71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2F 16696 bytes
SHA-256: 8bc451cff835656fa85b7706bc75aae41cbd250870b787a8cb3f44507924f176
font_02_sfnt_off00013a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A82 10892 bytes
SHA-256: 672c5d988f82524548893f7805766c7e8fbd0fb97ebad46fb9d07ee69465b54c