Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af118b4e2175f9f…

MALICIOUS

PDF

92.1 KB Created: 2021-08-22 05:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02ab28978f0e6b962918b69c2b00b57a SHA-1: 19c134f923b67c4088ee4797a8e656843c335c74 SHA-256: 8af118b4e2175f9f9baa55a9c76b584a2432f25f1b8727f2ac41b02e4ac4bc62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it is used to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://garglob.ru/uplcv?utm_term=is+hardin+in+after+we+collided PDF link annotation
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16103a15e3611c---verubuwokiwikosejovelulew.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fa9232f51---6330155091.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/os98r0pe1r4h3cb23545vle0h53l2iok/87623868796.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/377bf7d2f3bdb90de0574695a9ad5925/28818519019.pdfIn PDF document text
    • https://schmitz.cz/res/file/saviparetekibujevasuf.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16099d8dcb0cc5---nobawejamareb.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2b3cd7cb9c4b9530d330b5ca56af46f7/69413660183.pdfIn PDF document text
    • https://service-panev.com/userfiles/lerixof.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/slbqbq3mj39klacu7v4vp5bjp3/93071074820.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160957c3a56422---20904259135.pdfIn PDF document text
    • http://tw-go.org/files/19837058405.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/muwof.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/bofogub.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/86492bd8f3666569fc4d7d98eb031561/58649556370.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/25344273839.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/23294086601.pdfIn PDF document text
    • https://paperland.bg/uploads/file/bizikotipupixibitasawuru.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/14636705184.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/dofexowotidimerefi.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/84281270034.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/cc6c1975d81a83150b6238a67ec5fb57/vujaguxema.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/matovexixena.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/ziwugexunegolebajedo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/646949glnngk4d4ijto6m3r1d1/wetasikikofoduw.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a4dc7bfe45a0b883eb76d821bed7bbbd/34797609491.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/96509520637.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_off0001010b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010B 10608 bytes
SHA-256: ce3973d3b1d0768ed57643cc9ffd9b94421cc15be1a67da3e1860d45ee79b1ca
font_01_sfnt_off00011946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11946 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13158 18244 bytes
SHA-256: b7e089f2a341a3d3330db765ea0390b63833c488608833f7075fbf11e8cf1787

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