Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96f0c386c10d591…

MALICIOUS

PDF

87.0 KB Created: 2021-07-18 23:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 121770c90aa6cc37b2288847ba834e61 SHA-1: 9dc8e1f571318c124829abe9e2ef7a13ecc58cf6 SHA-256: a96f0c386c10d591c331e844ac32605e67eb6239ada3492ac6b7949a0f1d2bed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and link farms, indicating a phishing or redirection attempt. ClamAV and ML classifiers strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synersys.fr/contenu/file/sivilagunoruti.pdf
    • http://nessium.net/userfiles/file/63623259328.pdf
    • http://mya1fc.com/files/ckuploads/files/7170432225.pdf
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/papujiwapamezejadevut.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606e85b9c0f10---63929764156.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac83b108354---mumozawasanamujevadofu.pdf
    • http://pechati-piter.ru/userfiles/file/rejexawodojam.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607618b7120f8---64942799505.pdf
    • https://mbamantra.com/ci/userfiles/files/sorat.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/c5ccd3484b0dd7194b4a1391184efe27/xajube.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/ec909c33d3f7c23fae6295cc1b0e4ce1/10809248563.pdf
    • https://dm288.com/slicice/file/86626199916.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/a5ad08fdf22be24e9594be46f14eb7cf/fodexi.pdf
    • http://luluscafeonline.com/uploads/files/15340371829.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/45df53db03d1ae1eecd0bf632da8c8a5/20008890284.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/nilibeviwubofesifedid.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7e41fe6b22702704f8343c472e5724e3/tiroriwitavizuzuw.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e84cf4889b---59058085993.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0c4ae4b86---soxad.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/d22bc335a9dd7e828bfb3b2d0d4d7d1c/bikowokeraluturupisogoren.pdf
    • https://citrasas.com/ckfinder/userfiles/files/boluxajuzib.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2e77e4caf3---masaxonejevab.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/22772427f5dc84c56126012c1424c24c/56342040568.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/1b3c0a7f997aebd8f0e52d6317553894/34028233472.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/97f984d9216572a4cadd0d94004b8460/kubojowawopibafubav.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=lspdfr+tow+truck+and+coroner
    • 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_off0000f246.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 16792 bytes
font_01_sfnt_off00010a58.bin
ee7f85e3f9a095d067099a03b0b0bc4a997ba9e3821759ce26c62ac0f97778f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A58 16740 bytes
font_02_sfnt_off000135b3.bin
779d1c09190a49e5f2716071158bfc0a2608db0f8285a2d9e0f21650773a7a47
pdf-font-stream PDF embedded font (sfnt) at offset 0x135B3 10708 bytes