Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2e76c479e6db75…

MALICIOUS

PDF

85.0 KB Created: 2021-07-29 23:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fd5635db545bdcce92566f252dae6032 SHA-1: 067ef8207dedf482f55a912c823348d12ab5608b SHA-256: 4f2e76c479e6db75cf7fbfcba94b274f6913c4e6a686c9e813cfe2c74caa13be
216 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV also detecting it as a phishing trojan. The presence of a 'Callback phishing phone lure' heuristic and a 'Password-protected archive handoff' suggests the document is designed to trick users into calling a number or opening a password-protected file, likely to facilitate a scam. No scripts were extracted, but the document's structure and embedded URLs point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1c226b429---96987621082.pdf In PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/ririvanidajavubejizalo.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/85512762677.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/9e75663c4f9c362c5c6f63f1768dade0/22355866699.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/tagesuvusuvifexas.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/dufixalegusebozosa.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b06aa19b13---4280887280.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/26262ee69ca02c19a18ef0e15d92165c/polajinosolivede.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/15078098043.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/88537068409.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/54891306222.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/417320f4f7207384a6a4dd75ef3603ed/59962896421.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b88ad3eceea---96147097505.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e5dc7e4f70ee514af6b53de6839079b1/82402382341.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3af4ae1d3---9731564394.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/mibogimagajubuxivibe.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d4d8d8bc3---499799881.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/dc3d0c5d8e0ef9272e373e3761d607a2/welejutazugusel.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/f2cd5bdb1b8b47d7b0383724cc80c6b5/lugepanaliraririkibuv.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/buvevatetoxopidelivuzu.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b603e8a127c---mazenukiravenuk.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/bijavetonimuxedewagoneka.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd83c441e73---90359265639.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/dge345rj34i00lcfhccj7pmnt2/77754686732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+reset+my+voicemail+password+if+i+forgot+itPDF 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_off0000e4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E5 17420 bytes
SHA-256: c2f3d3594559b5602bbc089347ea0db12a4be921e55e1b3e1d060d631b5fc0f2
font_01_sfnt_off0001126c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A83 11116 bytes
SHA-256: 5a2e7b217c586119303a11b085933017fce7b1c9c1f5031c7fa59c5f9ff866a2

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