Malicious PDF — malware analysis report

Static analysis result for SHA-256 283e0a799bae657a…

MALICIOUS

PDF

75.0 KB Created: 2021-06-25 22:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5db249609470c05ef143b39b3e59315 SHA-1: 140c3c8587b48f8d0f0d7b1f41e8908bf83e504a SHA-256: 283e0a799bae657a532e1b469d818ca581c49de365dd4d5f03b5e9f4a3d985c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. The PDF's structure and the presence of embedded URLs suggest it is designed to redirect users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aeronautike.com/userfiles/file/rawenobozut.pdf
    • http://capitolmetrophysicaltherapy.com/userfiles/file/34446822692.pdf
    • http://videofilm-tv.ru/content/File/zoxopozisirevuzewumul.pdf
    • http://bright-mineral.com/uploadfile/file/2021052320244669.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/85f78e7358212180d22148ff1733a892/45864342527.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49ea551a5f---wosukolivefudobatidef.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e010aa25a---3336032237.pdf
    • http://preserveproperties.com/userfiles/files/89052533078.pdf
    • http://baigeleather.com/userfiles/file/jelisizikukot.pdf
    • https://soalmatematik.com/userfiles/file/gazududimedidajemojok.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/8c2e2bc46279a579a4851700b36ba253/60950189153.pdf
    • http://fairway.cc/images/blog//file/82842989536.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160843471227c9---tagafejibave.pdf
    • https://hzautomatisering.nl/userfiles/file/78809252304.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072d1559c471---zudamutosotuzi.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///20210530271_325548493.pdf
    • http://zwickerfoto.hu/_user/file/mopokupon.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608cab3f3d8b8---29607988888.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd16f1f25e---sibomobuxetitujizoj.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ba00528359f---18030880150.pdf
    • http://iwilldoit.ru/uploads/files/files/27088330756.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/e2e0ba0f323d04f118498c3105455284/73138322365.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f117cf410cbfb8615b491cd6aeead560/42789678811.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/ed6de69b812a2a4b1602ce57c65708f6/pakejoj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=all+to+convert+pdf+to+excel
    • 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_off0000c38b.bin
3d9893fe3cca6da5403ff6bc19db32b1ab768c443b8e01a9be84ad1226d5fc51
pdf-font-stream PDF embedded font (sfnt) at offset 0xC38B 10340 bytes
font_01_sfnt_off0000db0a.bin
844b6922546b2450bf654e0f766b5e267923316687c9e0cacfe966cad6ff168f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 16748 bytes
font_02_sfnt_off000106c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 16792 bytes