Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5a4f29af2c4462…

MALICIOUS

PDF

72.5 KB Created: 2021-09-05 02:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c6dff1cc4895c2ea867ac2aa5ccc888f SHA-1: 79c6c50c2f22f24e442a77afde274bc6a2e7bc81 SHA-256: 1f5a4f29af2c44626711299fd66dad9a26040386858a0433f3d2a3898faafd2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=luminescence+spectroscopy+of+semiconductors+pdf PDF link annotation
    • http://whatdwellswithin.com/file/gujigoniganogemoli.pdfIn PDF document text
    • http://amandamaitland.com/images/file/34482007234.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/rejifinapoporimigodopeku.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/02a6mrdau3834nmsqa08u0hvq6/38878708721.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/f2e714a8a98bd4ab86ef966cc327e747/3403806015.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9f1e0de14---belupavamex.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/84419060515.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/sapulosugogopuvazapajok.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/11086022839.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/91462051685.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/73593370704.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/wozemudenarakejidoju.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d7b9a458760e46926792f367c7f34250/44164886354.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/zisarodowoladobimifalotis.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/ralojekebeg.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/48895331548.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c33410f2b25---75275908819.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/deborusalerekujoleguki.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/rqbqlgs7vfee2r698blfc91jb4/23134758005.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/denumozakinajedotu.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/dumakabilabugorox.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/kazolite.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/takaxerunop.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_off0000b75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75F 10744 bytes
SHA-256: d58c7b075522231eaad0270cc06193a8f45f93a4717775626e028f92acf79b71
font_01_sfnt_off0000d00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00F 16944 bytes
SHA-256: bb86814994f865e90d1b07bfecc286487102da941aa021240da3c8e013aecb8b
font_02_sfnt_off0000fc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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