Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0821b1cac07bda…

MALICIOUS

PDF

97.5 KB Created: 2021-07-02 02:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b35c639180880e53ea662f18a8f8cada SHA-1: 66e1f17ecbfdf26aeadd69cc26d59719fc1c4476 SHA-256: 7c0821b1cac07bda437be262016a7edd47365ff43664809d0e440e36c7b5a825
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. This suggests an intent to lure users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mwasafat.com/uploads/files/71036784076.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/871c7a6bf08ab841848af5223c8cdece/mizuke.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/4pqd6gsl9o7u43smrar5c3tpmk/16222372902.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f7409f93b---96357029343.pdf
    • https://dintek.eu/uploads/file/lubaku.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/tiimtgsojfrkiubo3ijidutbn3/38733270409.pdf
    • http://baraanduliaptti.org/userfiles/file/baxaribaviwasab.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3fec284ba---belozibofubipepiwoz.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b923d2b3fc9---tutor.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/94a30ae5fcedbf49ecd84b0a08ca24a7/77001606664.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/8068cc55f722bee45cc41fb4b6f4badd/jawiwezixitet.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b865f78d6a2---wutujesorixiwoped.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba88ac90d62---1325944272.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5eb26035ff---6691657669.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086065ad4c46---8999315720.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160925e591af17---nuninovive.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b101b07c96---jijojalexowefidijegugem.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78361f312d---19112908953.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3daafc2ac6---sokodidi.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b3108690813---ditexe.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/009a6ff899032ea960ac4d521b80e550/78932970952.pdf
    • http://alrehabourhome.com/userfiles/files/3050070313.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb8fef0d33---wixarafunotev.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=minecraft+all+animals+you+can+breed
    • 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_off0001171c.bin
4722011a3a2d41db6d2197f2a325319937bbfddd190e356edea4315e57e3a39c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1171C 17608 bytes
font_01_sfnt_off0001458a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1458A 16792 bytes
font_02_sfnt_off00015da1.bin
63b0ec0a60e6659dfc21115f04cb55b9a300754a1e2e032feffd7386a6b602c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x15DA1 10984 bytes