Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f63d36726dc91a…

MALICIOUS

PDF

84.3 KB Created: 2021-09-20 11:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36889421edcfc725ccc83fad51f6c5e3 SHA-1: 2a1295197e1693fad1aac851e47d2c9a061469a2 SHA-256: b3f63d36726dc91a2c281a66e2d78389a638274a04ceabc1acf3afc59c9d4763
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to lure users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were extracted, the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dyaa.club/uploads/file/27597292139.pdf
    • https://speedwayinfo.hu/uploads/file/36089352828.pdf
    • https://dianthusindustrial.com/resimler/files/zoxelerekudoj.pdf
    • https://booknowrentalimo.ch/userfiles/files/tovuputimelujenumus.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132475b6695a---tujatikokopigaju.pdf
    • https://alansglobalservices.com/ckfinder/userfiles/files/vuzinolawoluzuwawuzoxoroz.pdf
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/50618327337.pdf
    • http://immobilieninvestors.de/userfiles/file/menekox.pdf
    • http://rungruangsteel.com/public/upload/userfiles/files/tuvunabesemajexu.pdf
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/xevadevoli.pdf
    • https://towa-aaa.jp/userfiles/file/79388643423.pdf
    • http://playbabydoll.com/userfiles/file/17341196694.pdf
    • https://ever-progress.com/upload/files/rijivuwuxusup.pdf
    • https://psihodesk.ro/ckfinder/userfiles/files/bulifumewulutagesunuw.pdf
    • http://bartuceviri.com/userfiles/file/38261358639.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/vezebizuridixadix.pdf
    • http://onthebroadway.com/CPD/adminpanel/upload/file/lufuroj.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161476cda8c81a---nilubevuk.pdf
    • http://client.diffuse.info/files/22735464728.pdf
    • http://neodermclinic.com/file_media/file_image/file/namogewikaw.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613223c39c6cb---19450871984.pdf
    • http://dongtienlamnghiep.com/upload/file/77430822554.pdf
    • http://euredit-editions.com/userfiles/file/8017330759.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/4c762903c2b457d11962b392d271bae7/segidakalufejopegelugeru.pdf
    • http://3e-machinery.ru/app/webroot/filesfiles/fejozojagitojajo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+download+minecraft+pocket+edition+for+free+in+laptop
    • 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_off0000e192.bin
c0a91eed4ca6ac058dfde2dc9d662e585053caabafd1ad75ee6b6f186cb101f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE192 18232 bytes
font_01_sfnt_off0001119d.bin
27b638025d6ee4b6b3f1a020be899ae51ab4bb7499a873e53b324b463153f640
pdf-font-stream PDF embedded font (sfnt) at offset 0x1119D 10784 bytes
font_02_sfnt_off00012a61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A61 16792 bytes