Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc20659c0b2b97b…

MALICIOUS

PDF

87.8 KB Created: 2021-07-19 16:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31436e680edd3690050ae59167adc04f SHA-1: fa4ad33d2dc590a9031ac5eca64b82c85d470fde SHA-256: 6cc20659c0b2b97b10264025fc973a4fa5877e0a650dd7ba2de12a759707cbef
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to host further malicious content or phishing pages. The presence of multiple links on disposable or compromised hosting reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/5eeb057ad1cdc7250877b197af3bb0c3/xujalifol.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f974e53a39---womofobifidinuf.pdf
    • http://tw-sincere.com/upfiles/editor/files/jazireviwapi.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/30f180e63b46bebaf12554ef462e8a82/25437870940.pdf
    • http://bbu.vn/Images_upload/files/8897269227.pdf
    • http://jualumnitoronto.com/editor/uploadfiles/voxezijatozisib.pdf
    • http://apexibd.com/uploads/fck_uploads/file/rakefer.pdf
    • http://exosportsante.fr/ckfinder/userfiles/files/tevebafigaginejotiwovu.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/l8oqhgkj5vcur21070pvhh02bc/xodigobowawenokono.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983a0fa5ba5---82447317822.pdf
    • https://xn--interpeas-r6a.es/upload/files/safedidojemepafu.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/nstq6itg253dojptuc7jg9m26d/depuxifeninufimafafike.pdf
    • http://sevinctekstil.com/resimler/files/wiluvufapizarud.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16092fe8fb93fc---92928652792.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088be468979e---311912408.pdf
    • http://cgpreceptor.com/ckfinder/userfiles/files/regaxerexerafeliwu.pdf
    • http://solee.cn/ckfinder/userfiles/files/votuxede.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4c5a6e416---51038709144.pdf
    • http://aivieksteslaivas.lv/userfiles/file/sukevitexoluzonumopowi.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083fce841b14---solosenuwapakerofad.pdf
    • https://eastmanllc.com/ckfinder/userfiles/files/zasoji.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c46a4f05f1566dcca28a06a49030569a/miginamemasa.pdf
    • http://fogathajtohirek.hu/fckfiles/file/56007267858.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=geography+of+ancient+rome+worksheet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000f202.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF202 16792 bytes
font_01_sfnt_off00010a19.bin
fe78d9b2dac9d4e060165e8e7caf35e5b78ed9de8a9165699197de14236c2f34
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A19 11212 bytes
font_02_sfnt_off0001244e.bin
733538fbecbb7939e79e279573baed07b6185d74f88808dc1154be0480dd5326
pdf-font-stream PDF embedded font (sfnt) at offset 0x1244E 17436 bytes