Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a260ba59339c93…

MALICIOUS

PDF

75.2 KB Created: 2021-09-22 17:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 447ffcf2cdd6d5e3da6e3239fa3f1514 SHA-1: 31cc1d8e54f238706882a6dd652145ee7ee2a140 SHA-256: f3a260ba59339c93e9abf7abe3c9f2b966a9bf9bfc932a93d062f04fba8a7f0a
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1555 Credentials from Password Stores

This PDF file was detected as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of a phishing lure. The embedded JavaScript and numerous external links, many hosted on compromised or disposable domains, suggest an attempt to redirect users to credential harvesting pages. The heuristics indicate the document is designed to trick users into providing sensitive information through MFA or callback lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ailizia.com/userfiles/55978670790.pdf In PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/29778963478.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/21299846190.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/76418450667.pdfIn PDF document text
    • http://goref.ru/files/file/powuvegexonusesevadon.pdfIn PDF document text
    • http://tradingcall.in/ckfinder/userfiles/files/92144698317.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/43140792646.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/pofazupu.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/8512793836.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ef1n4liucoqfggvvhsrq0715lh/pinaxetuzar.pdfIn PDF document text
    • http://apismorava.eu/docs/siwubadugara.pdfIn PDF document text
    • http://bushurov.ru/images/files/98240814310.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/fesilewozuzu.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8fb75dd5a---80981309983.pdfIn PDF document text
    • http://xprchemical.com/upload/files/16962991617.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/6276134c33081cbf1cb4b069b627a512/4122139548.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/81061031914.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/77009529242.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/magopiwok.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/pulozodakaba.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ac8b0e455---24940963900.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/10125781353.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148dab238f0d---14426000702.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/sebuxedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+find+deleted+phone+numbers+on+androidPDF 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_off0000c0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DC 11080 bytes
SHA-256: 4a2ba3a09dd1c2e6071efb085b00dfbfe9004d3dbfca7300decbc1d96c31de4b
font_02_sfnt_off0000f231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 17244 bytes
SHA-256: 79b580f11dad022ff8cd28b0a19c0badcaf5c18c68c2964104d7965350ec6852

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