Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de32f59028c4434…

MALICIOUS

PDF

71.5 KB Created: 2021-07-20 03:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a287c9cdf2affe4ebc46eae1763e3d8c SHA-1: 1536cd0cf53237f18add4a2a4240e259479550d0 SHA-256: 6de32f59028c44343013c09d86202c8ac3dd50841186f438a2f6f0f579fdf461
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ebsenglish.net/_UploadFile/Images/file/remekor.pdf
    • http://amsaneeraus.fi/userfiles/files/54285444774.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160b750abea5d9---dopumupiguga.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/3cfa51b9bf924fb82731a5f260961cbe/dogarixafurufojevekonir.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d37dfbb213b---nagijakij.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160867ea50f023---54077489003.pdf
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/4469368927.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/2359f0ba6b0ecc219d907cd5c70baa00/lofunizuxabubupudotamipax.pdf
    • https://travelinnsuites.com/nbloom/fckuploads/file/62876574097.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/kv7u3e5e5261ghknn1hbi429m7/vigojorojekafof.pdf
    • https://fajanav.com/aym_image/files/18560897770.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/ccd9f6a7c6ac7fa714834b6563c04386/wefuxedugosolipisidalixin.pdf
    • http://renovator.cz/files/file/61178098692.pdf
    • https://arvikabc.com/images/uploadedimages/file/xiguzujigowupabeju.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa438b9e6a---48330353818.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f15f9b1c9db---fupelerimovefotuwuretemo.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f15938c64---godezabasobibepoketitur.pdf
    • https://ktmcollege.org/public_html/userfiles/file/tapidaxipunesatevuf.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a98cd3bb5c---fudubexovifugul.pdf
    • http://nw-line.ru/generic/uploaded/13058099148.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/i4s2r67e1kum36b6ug1irss26t/toguranimile.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=watch+fast+and+furious+123movies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b598.bin
387949a5a6468afee0a7e199b7ae66e0b03c5eb2cbb6208ffbcab176dc9c0ec3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB598 11196 bytes
font_01_sfnt_off0000cfcd.bin
85a59abdb925d72ed424aae9c572f5cc7dc591166da2ea4f506b35504c870828
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCD 15912 bytes
font_02_sfnt_off0000f8dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DC 16792 bytes