Malicious PDF — malware analysis report

Static analysis result for SHA-256 86db2c3128255762…

MALICIOUS

PDF

81.7 KB Created: 2021-06-26 14:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f482f50748e664d74002878c04613bf0 SHA-1: c4e3cfd3ad784ecfe7b81c6eac4fad442b5cafa9 SHA-256: 86db2c3128255762ddd7aabc0dd891683f2e86c5b289caf9cf3ce4eb21702ab7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate the presence of link farms pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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.
  • 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 https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/fb59fe8bf5b2292a2acfa7abf91129c9/nilelibikubomikenasapi.pdf In PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/20c481b43d8fabdeb63fe720226156ce/lotafakebopajaro.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/ob43jnbc5voav4hu8k3h0pj3dj/sigivufodavovevuxunebilav.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160711cb105dc4---90245313674.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/pumobajasevanonisusilalep.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/fec063559ed3c67882dce9c4537ffe66/16329234096.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771fd0a338f---65101333850.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/87135054925.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/mqs1rcjv4shcrg9bfoil1qaos0/tazurokojakefiwiz.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/ronusufebozodotibazod.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/31bce65d1e45bc4ee00dd4c6f96f633c/39630145152.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/zosezobutusixatopoji.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/89872765116.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/basojegowamejolobok.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/pisiwikivogovizawisifeno.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/2140d46bd9e15f2719a73f31d097a053/33339789066.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/wilubopopejetuxijemimuma.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdac8b6cacc---62325154943.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8b6562285---78383959277.pdfIn PDF document text
    • https://x-software.cz/data/file/jazibalasofofolom.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/p616krn7s38uo91jf4gkvmhvm0/samesuwiwameti.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/56093609751.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf494eadf85---vetifarubexagovajoxov.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608526570185b---kevorijako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+weeknd+the+highlights+mp3PDF 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_off0000cf1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1D 28656 bytes
SHA-256: 300b9b19ca5fb2e0cdb9949109166706552c68e8a4ee51defbaa2c95bb393fe1
font_01_sfnt_off0001079c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079C 10768 bytes
SHA-256: 89920840e92e9e0b0fc0e4a487cfc83e5c959ec7081711caa75580a267e24668
font_02_sfnt_off00012011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1