Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3e3178e9bd166e…

MALICIOUS

PDF

71.2 KB Created: 2021-09-28 19:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 57413207181d7fa66768b7e6156cd08b SHA-1: 469c20444ef9fe91ceab6d6929763d4204127d8d SHA-256: 5b3e3178e9bd166ea08379a9e805c14d7aa5fd8985d72610bceec8405f862e8e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload storage and other disposable hosting. The primary purpose appears to be directing users to external, potentially malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b100e74003---zopamojuvula.pdf In PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/batifezaxixadaxi.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/budofalavixurinixolas.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/lotepumupubavopovuj.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/tabotidovidi.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/xodetiruxizuwovema.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/52867768524.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/92258567be7c39cf4969c3663c19ba19/60873637021.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210926043008.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/72f6507768e087302b5ad7dbb14eddf2/44772470955.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/pilaxemit.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/96525328516.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/32288381157.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/41663686594.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/nunulemasu.pdfIn PDF document text
    • http://szm.hu/userfiles/file/puxel.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/56996500274.pdfIn PDF document text
    • https://materiale-parchet.ro/fisiere/file/vojebesufujiperulikasuj.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d51d16e534---35754877485.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210902232842.pdfIn PDF document text
    • http://kag.fr/userfiles/file/26236917120.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/27508714963.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/dofasokobofulopefuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=boruto+naruto+next+generations+watch+onlinePDF 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_off0000b1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0B 10852 bytes
SHA-256: ee8e9a2d8464c2cc6161bf8a2c3eaa8f74abf01d4f9c6f455464be8cafe9d818
font_02_sfnt_off0000e32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32A 16452 bytes
SHA-256: 5402861892155858059ef663d26af3b1c9f8f0dad9bf75a62eb48af94ee8aa9a

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