Malicious PDF — malware analysis report

Static analysis result for SHA-256 9344842fa5431be5…

MALICIOUS

PDF

87.0 KB Created: 2021-07-20 17:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1b9b803f697f4de063b437d817cff880 SHA-1: ddf822e2d51c72fe4d72efc6b564a40c5b6a7b4c SHA-256: 9344842fa5431be53499b9f3c72990b400458754e27e73dd1c17063e973a9b09
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous external PDF files hosted on compromised websites, suggesting a phishing or malware distribution campaign. The presence of multiple external links and the nature of the heuristics indicate an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://universal4shipping.net/userfiles/file/nubexekujoxen.pdf In PDF document text
    • http://inse.us/uploads/images//files/turiwijiwifevu.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817bdeb2b14---75566386553.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/fb93bb5a0a612b412b995ae03c6958ab/94207921618.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/40240811278.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607decdab6764---78858423815.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8722408d7c---50403936902.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/ratiluzerejujiludutupi.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd1bc430c9---1355433005.pdfIn PDF document text
    • https://bczenekar.hu/files/file/wogog.pdfIn PDF document text
    • http://springbook.no/files/xosodawukoniwirozufesobar.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da37832afac---83049166888.pdfIn PDF document text
    • http://apcmagon.com/userfiles/69561983719.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/ed52abd9e29ff051cf14fa0e733889d8/79608431425.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/206195776f5c7a93e15fa8ad9b591e29/medexujatewasowojuwag.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dddcaa3d3---93433641438.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/sosolareramufufezotune.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/31334595820.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/pifolilosizutijawofana.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/rpl9vbii7tslkppnrd3qc8pup0/88022411752.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8ce0d753c---meguponed.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/66231488449.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b896cd692a4---79674660974.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/pijujudedewawalaneji.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/71241952346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=pdf+readers+for+windowsPDF 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_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A60 10288 bytes
SHA-256: b95eb7eb98f315cfa9e6d5d364d81e3b7bab696273593a11c8b944b2a22123dd
font_02_sfnt_off000121b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B0 17200 bytes
SHA-256: 4f33cb6676ef06e945fb12bde6842cae01bcbfca74682c15e67c864ab251ed8e

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