Malicious PDF — malware analysis report

Static analysis result for SHA-256 19695b7f53dcfd21…

MALICIOUS

PDF

106.4 KB Created: 2021-07-04 11:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: aeedf32fae35aa7f5821dd5d3a61271e SHA-1: 6a9296ae9326baa661731cbed075fde73765ad57 SHA-256: 19695b7f53dcfd21366fd9ea52e3b94580588e74318949c963c58a194e149860
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the 'formcraft' plugin for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The presence of 'utm_term' parameters in some URLs suggests a campaign-like structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

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://irlanc.ru/uplcv?utm_term=turned+me+out+meaning PDF link annotation
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb0a9eff7---77529686187.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/kosulovive.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cc295e809---41173510387.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/72717394815.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f6a434456139e324709c28370416e122/89421768610.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/nesamupizojum.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cde9a5996f---batokewezaresozomob.pdfIn PDF document text
    • https://webmenuplus.com/images/file/52485299712.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/fdaa7dd976d1db1728c9130adbbf7133/texifisenirexut.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/0bea2584d491bfc9ecdc0e8305411c17/51044199609.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/eb27cdb516d7faa6464cad3bc5d4daaf/93875242850.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/mafaxepubesavarivizum.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/34675822454.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/38804987907.pdfIn PDF document text
    • http://freeski.hu/freeski/file/95658999372.pdfIn PDF document text
    • http://iringmalaysia.com/ckfinder/userfiles/files/49195678746.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2a2b776d9---zatifovobewulubosabas.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b162634b1---19949132838.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/vabozesivupumetalor.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/e4da81ad14544bc7c922a4ce73414d6b/juguviwina.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/26786476417.pdfIn PDF document text
    • http://bociany.sk/media/file/gibodifowaradiwomupezek.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/93076790740.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F68 3464 bytes
SHA-256: f146773b15ae07f793bcec37c93b4108c05e1835fec86e922056f408b44a0a43
font_01_sfnt_off00011d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D62 10440 bytes
SHA-256: c942b1570dd96e8ff7ed9ade7ba6b0598c861e3c035859eff556368eca4551ce
font_02_sfnt_off000134c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C9 21376 bytes
SHA-256: 3e6ac538b9c1f03b11dfd0745f64a4ae01f6fbfa372c7d3bb85d3d055e457fe7
font_03_sfnt_off00016c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00018433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18433 16480 bytes
SHA-256: c4887236581edeb0947ee9c7262a34b31594f72668d1260b61fb6126747f8cac

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