Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb1b827ab720099…

MALICIOUS

PDF

96.8 KB Created: 2021-07-05 15:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06471df454c278e2c06873ad217033a3 SHA-1: d36fa97458c2e3fd8ac73597d19781e9361af516 SHA-256: 4eb1b827ab720099865f23e55f59b008e83a858057b6fb22275c335e8727ad79
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. ClamAV identified this as a phishing trojan, and ML classification strongly supports maliciousness. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the embedded link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://allytemp.ru/uplcv?utm_term=fear+of+whales
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/cd8a22fb4641f03411c68b5d41022944/vavuxaw.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0ca9a5bff04ebbcd73aaa2a72a2bdd9c/bidomakiniluxekubuv.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f1f2db88b---69664013532.pdf
    • http://golden-candies.ru/webroot/files/files/88199849722.pdf
    • http://chizclean.ru/files/fck/file/13482306072.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f6dbba2b77358904c293c0e0e3118acc/29552318446.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/0q987uneqggsdidkg9apj4qjmr/12997158547.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607c7dd56a2f6---36038627700.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e4db43c24---60632217981.pdf
    • http://botosani.ro/img/uploads/file/rexekuzixapibaro.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608701b4545e1---26446341816.pdf
    • http://beijingxinzhi.com/userfiles/file/20210517074334_1522753360.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9e862f616---pigituxaseduma.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dab0d917e36---gunuboderemelaselulisi.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60400b075b---52732463298.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6caa6566eb---jitogonusawenudisadi.pdf
    • https://faktxeber.com/resimler/files/63512224568.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd932310c---45031943773.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16088b7a39ef71---mojarilalo.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608d26845caae---nabugomo.pdf
    • http://duonglaohanoi.com/userfiles/file/78700537855.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c724f0246d---rameresojugudupu.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/8ed4ad56786e0fc302fb438d2b345b22/fumewaxikis.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1541ccb4f---xejogelizogoriv.pdf
    • 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_off00011a7a.bin
c12bb8a815bd47fe05ecd3cce54753f9cd115f550147a5d741e897cc11a420c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7A 10080 bytes
font_01_sfnt_off0001311c.bin
388b0ab5b0fb17e47c13afd029c7fe419b09ac539c06080cbe34cb5430bdff34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1311C 17292 bytes
font_02_sfnt_off00015e03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E03 16792 bytes

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