Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4dec6b17351e70…

MALICIOUS

PDF

69.7 KB Created: 2021-09-04 07:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c63d0b63b36e62690af6ca631d58544c SHA-1: a57b65fb7e540ff77fff39f936d88f3ceea31993 SHA-256: ae4dec6b17351e7036e78bb3a307fb40a8276b3b428984ceac5b5ac26a9fd0e9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs a common screenshot lure technique, indicated by its small size and image-heavy content, to entice users into clicking embedded links. Multiple heuristics confirm the presence of link farms pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://coretry.ru/uplcv?utm_term=worksheet+present+progressive+tense+spanish+answers PDF link annotation
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612761dd71ced---17590291441.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/14624638190.pdfIn PDF document text
    • http://lawngo.net/fckfiles/75060211484.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/wufeboli.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/sasebesapulaxaxelulikaw.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/kobudelanib.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094820c4b184---6627523277.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ae23dde50---wejurakexixilaweji.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e5cd88702dfdc358480a2a1194434c2b/mewiminipusizurijefube.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/takokatepazetuxulafidi.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/81bce00e93975446bb9fadf21a589c58/romaforazu.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6afb11d36---galajix.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ed092d37b---91313100304.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c409dccdb---26325618593.pdfIn PDF document text
    • http://it-hair.com/userfiles/jujumaravufodizan.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/rebujowixenevete.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/00d95ffe542128cdc84ae56f4fc9b65a/83555816122.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/ba4ab77b7cbcc378523c0075f6d35c31/xinokigukoz.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16096c3d8b2600---gelibarejapefini.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/doverabiwerajunezib.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/10429826559.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/61482633656.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/f90f974c5fb3b3af749a35bb0d7e320f/22774290474.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/wetuvelulogixunawaxino.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/33586509040.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/53153086616.pdfIn PDF document text
    • 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_off0000b49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAC 14204 bytes
SHA-256: 91141ce81ca5653e100705746dfcc6b164ca383e9d284ef6834e1051ccf0370c
font_02_sfnt_off0000f047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF047 10720 bytes
SHA-256: 2fcee81fb68a344ebab0bbbd09985ad609de7049ef1271936000c01146280873

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