Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec818c5d8320a22c…

MALICIOUS

PDF

85.5 KB Created: 2021-08-16 15:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 68af957a429edd6fef40d66cf1d02398 SHA-1: 062e0687444b610d9184d674fc6f99ca7110bcd7 SHA-256: ec818c5d8320a22cd107438ccc77dcfa1b3ade97ff86fd7007e3c206b0e3810c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This suggests a multi-stage attack, likely involving phishing or malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent, with the link farm serving as a distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f32c5bd9a---figiruwuworu.pdf In PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931fb4ad54c---43744618762.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/71493321100.pdfIn PDF document text
    • https://paperland.bg/uploads/file/73303460249.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5c31434bd---febojedimagomenozulevefog.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/32632318088.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/pusaxobanukemeleketufup.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/q4vfrm1masjjl6qu8mvd7smasv/68732699431.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/sesomanezibutunezalav.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/goduzarixuvuzataxebilad.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/38410695061.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/94632188217.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/a39bc5df98aee9f44786b76ba85608bf/58613655102.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/c4d40a57b1d1e00b86b61cb2d16b86ea/86447672657.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/10225605881.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/sphf2ppa041s3vccgk2as7oke7/kapipapuwukitanupidasu.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089b2a497f2f---notevezofidimukov.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/83135824547.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/20480679012.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/merexamugurirefagozolosep.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/debituvedunirimurelone.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aefb96fc53---59189803297.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/a30d6fbfa1206c5928f68160e2e64402/24292345616.pdfIn PDF document text
    • http://rinsacars.com/files/others/63827487581.pdfIn PDF document text
    • https://krossi.ru/images/content/files/11255613215.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/89175491236.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d608d1141da---4137260378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=manual+esquem%C3%A1tico+de+criminologia+pdf+2020PDF 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_off0000e006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE006 19976 bytes
SHA-256: 0e096287c349ace91742b17ae67b3cd5793d39dcdaea859d57c7888f53fc8d95
font_01_sfnt_off0001115a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12971 11624 bytes
SHA-256: 35624c5fc3de96760f525bf48d64fc6a79ab3753ba7fd17cfc0ccaadcf65b678

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