Malicious PDF — malware analysis report

Static analysis result for SHA-256 682036807adfc3ed…

MALICIOUS

PDF

77.0 KB Created: 2021-07-24 13:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6a258e204f1f8bdc8787e6a766cf781 SHA-1: e47cf98924a8d0486aa63d8fb59c25c8865c28d3 SHA-256: 682036807adfc3ed69dc83a86e659d858a85d9a296aa95e5d928594d085dcdc0
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. 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 phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8342

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://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c359c72000---64693881322.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14a72b39d0---witewilowud.pdf
    • http://k1a.ru/images/files/file/29927103331.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/4c1b8641502dc1c971e46b49f1ae9d4d/66788469874.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a01858a4e---wowoxesotesomegasuvoke.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/318080ee3551c5dbb5d65a36ce46baa0/dezesetukelonovasubeval.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/cj01b555dn50d1jc3896t5vu3n/1721588513.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/49ca6819a6fec940a34810a2f3d6608f/20279157328.pdf
    • http://trustarshida.co/cache/fck_files/file/4980367082.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e1b57db44---pumefokusokigepizi.pdf
    • http://casier-a-bouteilles.com/file/rakiliwagezetonemigozapa.pdf
    • https://mimpishio2bet.net/contents//files/jukowawejodujaboxeb.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4cc8d4c64---2936025675.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16099165555aec---doxexofijugunukimor.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/6e00bfb8e9f076ea8915cbb4780fb357/sulekogozu.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/4519dae705c53c16743d9ce7f60f2195/mozutupafubukolotivalib.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/3a638c4b3632a8f37441ad20025ef010/4632623097.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/k9bfa8sdtoa3kg3bp8c6hbcbuc/japaba.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/p2mun1uen63p22t23k5g5kk45m/tarusif.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc9613e639---76189383822.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a9e75705c---40711009341.pdf
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/jisoninepukuzexut.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=libro+fundamentos+de+economia+jose+silvestre+mendez+sexta+edicion+pdf
    • 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_off0000ccad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAD 16792 bytes
font_01_sfnt_off0000e4bf.bin
fbebc96d17fbcbd4b894ff9f25135f6b1403d4b71135d8b559276fe1e228266c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BF 17444 bytes
font_02_sfnt_off00011196.bin
a7c354256a710b88ed0eadf8f1df248d0bb8ef415958993bd5c17ad7fb0abbf3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11196 11336 bytes