Malicious PDF — malware analysis report

Static analysis result for SHA-256 abca1cb73cc78018…

MALICIOUS

PDF

89.4 KB Created: 2021-06-26 03:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c29c22fc5e8b3a856d31e53d03adaa24 SHA-1: bb61635debee991c3fc69ddd37b5a6f4f48bb521 SHA-256: abca1cb73cc780184ee757c01498eb9306a3b8fd14ca74d1e90c9c1f8a84ee38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/97dcfc1e2557b174b29e97030d559057/wuxelixajoruvipusurus.pdf
    • http://www.findvoters.com/userfiles/file/pelilajorasakep.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089024f4e790---fasimamerojegasixesa.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b521c517a0c---10180118729.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dbc023de3---32233928826.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/6b1d08d2f8852364ad85072a90df18d1/62360463674.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2666b0cdad---lasegiduredaro.pdf
    • https://arhometutor.com/userfiles/file/6798723825.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fca29c5f03---31460559183.pdf
    • https://brtim.com/uploads/wysiwyg/files/30616654105.pdf
    • http://gayaarchi.com/userfiles/file/20210615200652.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d68de8ab0---kazakumufikezareg.pdf
    • http://espacioschillout.es/images/admin/file/xemetodikuketel.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6793787a0---sufegujifubekojigel.pdf
    • https://krassimirtaskov.com/userfiles/files/18729897008.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba910fcef72---45632499560.pdf
    • http://limoride.net/gallery/file/29146961165.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/emr78h32rps0orisvdvjsfm157/lanutafa.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/p7enu8bjct826mdta4j2v5knl0/83495011529.pdf
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/73035438151.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9014321609---vukexolemu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ultimate+stress+of+mild+steel
    • 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_off0000fbef.bin
3073d6eb062080a3e9bc8268cc0c67fc92c313eada1063901206351ddb824e1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEF 17644 bytes
font_01_sfnt_off000128bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128BD 16792 bytes
font_02_sfnt_off000140d4.bin
f84d8b9061b3905c12fda4f1e15714a945b6d261f76c98fad3291ec67d8a47a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x140D4 10420 bytes