Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e0961e71636d61…

MALICIOUS

PDF

84.8 KB Created: 2021-09-05 11:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5408ef9dc24a3fbf8b28fc4a036ac0d3 SHA-1: 754a2dee96149ab225337fab3da65d44f66bc5f3 SHA-256: a5e0961e71636d61efb34c9ace6a6564626f9b59f3b2ac8f9026fe5364fc0791
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of a link farm and compromised hosting points to a tactic of obscuring the true destination and leveraging potentially untrustworthy infrastructure.

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 http://dailycan.com/userfiles/files/94435322229.pdf In PDF document text
    • http://www.tekkoo.net/images/library/File/mobilusobanabudexa.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/17780777721.pdfIn PDF document text
    • http://captainkillmite.com/uploads//files/202108061317214623.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/virapibidanesiterevik.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c98c5a858c6---tagorafekarowamizali.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/59157581775.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/9dbd78231c94efee7fc2455d27954474/60202184844.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/12172732497.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/toghbekijfv6420r0mp4l8bone/46888366289.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b759de5f54edcce2878258ff1bf6e083/53805552873.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/42976960317.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16103959aeb84c---72867580793.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/212711674560e5311bb34af.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/e6bd54e8ad6e1fd613fbaadd355657ec/92566010759.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/66371228266.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081af3502035---sasagix.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/kesipuwosijinajuge.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/wavalewide.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/56301566726.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/ce2bdd35a193b90dfa5ce429eca517c1/wovakutiw.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a481d75cac6---91474175343.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/vinawoxudorota.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d487351b1---zesaxipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=personnel+management+and+industrial+relations+pdfPDF 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_off0000e6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C1 10944 bytes
SHA-256: 6ed4eb1510218dccb7274e8e169483514cedd365741477411ba9ce48a92264e2
font_01_sfnt_off0000ffec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FE 17328 bytes
SHA-256: 2f7ee69363c4f1dfba751ff6a1148c98defd08587b83491b34c9cf6e7c0816bc

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