Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e6d202156673bf0…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 19:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1ecbea726a22c890fea0eeb14c800b54 SHA-1: f6f97abde6d94bf8a80f45fc10b2baef273b3f31 SHA-256: 1e6d202156673bf0ff0ac0f87c5b4fc16c7c008538bbf364f85d4f6150025073
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF-specific heuristics related to link farms and external URIs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://mertlakustika.cz/images/pages/file/kipafefupozuzekeranepoz.pdf In PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/31395559677.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210624152343.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/69042619566.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/maxivenifaliwagabuve.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/5737307554.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/67913435172.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/likameganukixesukuvix.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/56573273948.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/76996667153.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/f2120e038223a50344952cefa9b790b3/13432345985.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9af7804a97---zadimajufevizotobedi.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b8048fc4fc7---lotekafepuruzalapu.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/pitilufifevijaxovagilawi.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/ae18604e56d3ba3c0c2486985a9980be/92693325846.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/wosuxirexusuruzun.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607de31fc8678---wupoxokugojazak.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/prbg0n90ebdl73akrbpioql986/3789439536.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/38aa654d13eb42065202c59e6a753289/jareso.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/36a8b2b1badc91def232ef34877f932d/kudonemalera.pdfIn PDF document text
    • http://casaalu.com/luutru/files/togozulezibuvujaji.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e9306fbadc98f7d73194f6dc60c794e1/1811066800.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/62844730841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=bosque+seco+tropical+ecuador+pdfPDF 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_off0000d4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEF 10808 bytes
SHA-256: d51643ef071e082f088ec4464d74a2172d58bd6e58ee75c778da74d21babdba9
font_02_sfnt_off000105cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CC 18956 bytes
SHA-256: dbb573d730b47d0a3fc29f69708b73324f892e2e54e1967c898902f701050bd4

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