Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9939fb3aca150a…

MALICIOUS

PDF

85.9 KB Created: 2021-06-27 10:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f38cee3bce69dbfa8da08a8a541c6c23 SHA-1: 332838ba5d53f2e3371a7a4bd5aba4ceccf1b66c SHA-256: fa9939fb3aca150a41cd60aa9b61a01620816384a6bad716973a14aab4cae58b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://cissud.eu/uploads/ck_editor/files/21598439347.pdf In PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce92b241ed7---70411629902.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/c19c92370c24480a1f7a96e085431569/wedadabukijikemomojatiku.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b779f6b8170---burezinemabosageremome.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22e37b85a4---nipokexorezovaviradukaw.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d0ad8bd438430d4a277a5a25b0b42a8a/dovulafawivetefera.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/dozabuvozotumud.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/h024mgj4rfvm3km9vjrgtg89qd/74760927083.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/29517c7cf18d0659f99ccb8dbf2e1212/36265347137.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/juxigejogadojunokifadis.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/d4581d5911ebbe3b748b83124fbad810/77431760274.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/879a397c89f4ef0372f324929e413e63/74784677964.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6ea011b2bacab2371e141bc469173fbb/nalojorexugurewikanolas.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f161d819a---1789228275.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/30671017071.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/65921519700.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/4ld3dl7kbfl4o1o8fh65692gnq/mikesemeges.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afab8a27764---nodamurezozerodevujatido.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/koxaneligige.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070783a62237---98885061882.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/muzesakaxetiziwujabupal.pdfIn PDF document text
    • http://carszana.com/image/upload/File/15295374730.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/salumuxegavawe.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8348ddcd0---42471896907.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/55404428fe6dcb6bde84b86cf5b7e8bb/gipisediligizopojawumi.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/tujanasurosavibufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=jesus+said+fear+not+for+i+am+with+youPDF 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_off0000ee41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE41 16556 bytes
SHA-256: 10c75960a3d5125cbf3a9c58e0b34f0afb76f070efb44c24d7d889d349c254a0
font_01_sfnt_off00011934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001314b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314B 10864 bytes
SHA-256: 27fe57a983edb5ba2a89a5dc276680a230acaf0953f4e2980dd1463780045d4c