Malicious PDF — malware analysis report

Static analysis result for SHA-256 437b5931748745a6…

MALICIOUS

PDF

84.3 KB Created: 2021-06-26 15:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91bae5d2cc38e471306a12ebe33d1538 SHA-1: 54a4948c708ec8664cd47b84cdead0e66911830f SHA-256: 437b5931748745a6d822db5014bb915f92877576b564675069904af19a885538
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content. The document body is unreadable, but the presence of numerous external links and the heuristic findings strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/8d80a236b5d7294760d2c3356002cd97/jigizubijofof.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g1csbl5256bfc2egbrsmpc29o5/xejubuzotawod.pdf
    • http://colescastle.com/clients/875019/File/panun.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/a51a7ec365afc2a04bbef74d8080add6/16095113517.pdf
    • https://goacetours.com/ckfinder/userfiles/files/jevukome.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/3a709e94aa0fbe197366e017daa4a175/wusobup.pdf
    • http://446888.top/userfiles/file/ripirotokugexejupuda.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4ff6ab530---40281477966.pdf
    • http://winfielddeli.com/ckfinder/userfiles/files/vizawufekuxegupozelozutos.pdf
    • https://adasms.fr/userfiles/file/didipudoboravigilarewovej.pdf
    • http://hz-karavany.cz/ckfinder/userfiles/files/pazonelifisi.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/0fadaf20ff3e52e57215f939f832daa2/85347408330.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/9180a49e656ae7a09d0cc3af358fd573/zadivovimomewe.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072881910a54---dawaxagotoxobozivokili.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8741e2767---sopumo.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/0jcubsep2ng21586uuu6l5sd6k/tosozazobuturasato.pdf
    • https://equantumconsulting.com/files/files/rakuwazawalififeb.pdf
    • http://petukmahaaaraj.com/userfiles/file/1952199777.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/puvotaripunipapinewesevo.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608851427d5b3---27382715517.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b42307b064c---moloteragamisodoxew.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e27dd9f649---95216683259.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c9f41867d---wibezulonebotururivat.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/20d2ea43d47d0171d6594c8d7d4e6718/pizurugenesadelorediredu.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/eff6a6e23f77655153b79d8744ed2953/67799480782.pdf
    • http://luvnchrlysenglishtoys.com/clients/861429/File/67504841588.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=emendation+in+a+sentence
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccb5.bin
982835c2ec845d42120defff0f1df80c22a5fa8548c62688cd8a97310a18b53d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB5 17904 bytes
font_01_sfnt_off0000fb5c.bin
0862d32aef41de8a949d1cc7f0b956f89923ac4682a3f81fb545b04451769123
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5C 17068 bytes
font_02_sfnt_off00011411.bin
a1e33df7d8a59ff1bad626c504773a04fbe270c640fc6b566c38f0329a8746cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11411 10368 bytes
font_03_sfnt_off00012b7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7D 16792 bytes