Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6afa5de1ce76383…

MALICIOUS

PDF

84.7 KB Created: 2021-06-30 10:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4177db395386d86e0d22b1510b7f3804 SHA-1: 55e59268994b8c92a56894012cd8444a5f49f4a0 SHA-256: f6afa5de1ce763835708220a6084d3cd54836022f31ce0be7bcec18ebeac93da
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially harmful content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an effort to obscure the true destination and potentially engage in SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c93110137---70837186127.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/3kvv7ju3t94kpqk3s51s4kkehj/3119145406.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608477608a201---vuvojene.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8650109f8---wuroxevanakogu.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092358241d29---50329011236.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/73095a1b934ec114d324089e954a2010/mutebokazegepuduwujoxat.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb972761d5---pakotabuxuwulevibod.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/24437f3bf70cba153dc59097cb9e201c/kerarivobaxepep.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb685f33b49---67153082797.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/66cd3d3d123b8531c5b3b1216461b944/2629242183.pdf
    • https://szud94.hu/img/sajatfile/files/ruvunesatovepidapekam.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed54c4c525---nudasak.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/pukaw.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/dc7118fbb9094a8c2c4f9d048b698b7b/gunovakavilubupomelezoke.pdf
    • https://cowichanseniors.ca/userfiles/file/jewevitopusanojowa.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab11136c9c---wapodaxokokedubim.pdf
    • http://extracam.es/app/webroot/arxius/file/pawuz.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c392329cc---76387728334.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/24ee7291147deae5f3e1fc1d2c79ceb3/gudazezejatumemufunojixez.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/1885347726.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e12351350---duvivem.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/fb82ce8fd1754031f5fa2fc875d5c714/29895441292.pdf
    • http://tradeweb.es/userfiles/file/fanogigepegobufabugu.pdf
    • http://www.cerathai.com/image/upload/File/83317147382.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=compare+and+contrast+table
    • 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_off0000e4b6.bin
80381c60b051ded9bf5a06eb434d10a974d9faef5d74ebb60bfef96462cf0838
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B6 18608 bytes
font_01_sfnt_off000114eb.bin
090349f58c9351810dc0635ba5184b6bcd6989adfb49d010275775bf3551d2e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x114EB 10756 bytes
font_02_sfnt_off00012d73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D73 16792 bytes