Malicious PDF — malware analysis report

Static analysis result for SHA-256 e464afbdd71c1ad7…

MALICIOUS

PDF

85.2 KB Created: 2021-07-01 17:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4c0ffbaa5848e6f7586b6991344894f SHA-1: 5ee5394df651a76fca09ecc3326831642453a602 SHA-256: e464afbdd71c1ad7923168beaa7c39cdcc0bf911487c911ca5885e8a4c284fbf
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 compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://ocw.tw/uploads/files/depekevugabijifuf.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/2kkol2fdbq3gls8r3t01jp4s13/17932828045.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16081b69367c9c---norezapuxagatiwewubinifu.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/1669fb638a7a2c94a83f5c44680ee1a1/zututerokugabuzelebi.pdf
    • http://renknh.com/ckupload/files/55755026845.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/790211c197e6d59e184bda5933590cfe/pumizapunaw.pdf
    • https://ancoraeducacion.com/images/melobifamapajaviduzaso.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc9d2b4b0a---velazofor.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/d54c6m44grcvlj1iuu7uhnpk94/13313754106.pdf
    • https://alshaabcoop.com/userfiles/file/wuxupilupesirumevumufowuj.pdf
    • http://lamelove-zakryti.cz/userfiles/file/kajulosuvepira.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab66c1e29---damikik.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e9561db53---tejiguxobi.pdf
    • http://www.deep2001.com/images/library/File/bonadalajowifafi.pdf
    • http://becucci.it/userfiles/files/50158680552.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cb2ff0486---60610086465.pdf
    • http://ac-kenigsberg.ru/files/file/60727486504.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/45bd12530deda7dfd52032311d4f81fc/94363963873.pdf
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/63189481865.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/49b24a4deab7cfa0bf543d7a30242bb4/xafudutoxuragevametusa.pdf
    • https://rosewoodcity.org/nbloom/fckuploads/file/76379705606.pdf
    • https://mayurherbal.com/userfiles/file/gixusoxelopakogoj.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d1a33d60a---24479230022.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073832b75348---99537426138.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/1q2o471lr6lm8qefe5ltfnfeeq/27359023944.pdf
    • http://densayhongngoai.com/uploads/userfiles/file/mitamupezemaniz.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073e65580e60---punevogadirumelilotezume.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+equipment+is+used+in+netball
    • 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_off0000e9bf.bin
c464f81e07121acacb9d8262f452f91f7a7d9a9b1aa9e7f8e1ae06723212a498		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 17236 bytes
font_01_sfnt_off000116c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116C9 16792 bytes
font_02_sfnt_off00012ee0.bin
af616fc04e2370af82bf1f3e595ebaedac77d1aebbf0a5f4abea2b6e26604cf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE0 10816 bytes

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