Malicious PDF — malware analysis report

Static analysis result for SHA-256 82686940681d01d1…

MALICIOUS

PDF

75.3 KB Created: 2021-09-16 11:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17d486feef8172d2c17ba9fc6ec24d3e SHA-1: b263c695251add31c6fd7355435ded265ed460ea SHA-256: 82686940681d01d14e4c691612f83dc3f46d65f64fc988430dc75d45e98eb18e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

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://temple.mo/userfiles/file/49164745459.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/oc4e9fmmrg1hlel5uvq24jjqc5/wemenuwojisedepe.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaac66894a---nulunusavepaxomezoxeb.pdf
    • https://hotellemaritime.com/hotel/upload/files/11229952907.pdf
    • http://haliburtonhighlandsheritage.ca/userfiles/file/85128454775.pdf
    • http://szyldkj.com/luodan/images/userfiles/file/55792260934.pdf
    • http://zoekidsworld.com/userfiles/file/9070073702.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdc38b10d0---50377570984.pdf
    • http://bachova-terapia.sk/images/file/wenepevabes.pdf
    • http://location-appartement-venise.com/italie_documents/files/zabapapimukuvunibiwa.pdf
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/jixasa.pdf
    • https://landtop.com/filespath/files/20210907190349.pdf
    • https://arrayamed.com/userfiles/file/89870901338.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16135f30f4a9ad---gudodama.pdf
    • http://pol2-simf.ru/userfiles/file/45001300717.pdf
    • http://dancephoto.ru/userfiles/files/jonelufarekokatasuzago.pdf
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/8058073599.pdf
    • http://frigotechreina.com/userfiles/files/28757296462.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d665c0fb8---redaleduxikujaduvijira.pdf
    • http://benthanhsgfarm.net/images/uploads/files/15973853221.pdf
    • http://www.hangmandigital.com/files/file/46823870500.pdf
    • https://gulfsupremesa.com/ckfinder/userfiles/files/sunofukesufupigasab.pdf
    • http://denge.aero/upload/files/gikofe.pdf
    • https://alamansyria.com/userfiles/file/57341719300.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=direct+tv+remote+control+app+for+android
    • 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_off0000c4d9.bin
d0f7b9498f57a18ee0675ea47a4b5957a363b35866ec098a85e4683f27201aad
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D9 10680 bytes
font_01_sfnt_off0000dd51.bin
e8062165f6f056273906a3ce9725fc14caf77d93e880e92e3ab3bd12ddad3be8
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD51 16252 bytes
font_02_sfnt_off000106fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106FA 16792 bytes