Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b27516ac495c3e5…

MALICIOUS

PDF

91.7 KB Created: 2021-07-03 11:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2983299d4a01599c35604f7203eabe75 SHA-1: 0f57655142a77f9a6a9f07d663b531cb685c2311 SHA-256: 1b27516ac495c3e5c9ab8da7a0f1419d19cfa141f0225d100e8f91c1d93b989c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a large number of links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the presence of numerous external links indicates a high likelihood of further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609434ce9e1b9---73235489379.pdf
    • https://etcbt.com/userfiles/file/mebeduw.pdf
    • http://aplus.to/userfiles/file/40299119650.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/2329c8dd1a8cf8bcd9c900b92c76eaa4/kirozivoxenazavevafuj.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d57d868a011---74097836070.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/247fdd5a80c6a0448eae2fc672c01a00/78976287110.pdf
    • https://jamurgoreng.net/contents//files/57664581306.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4b3497f2f---pilovujufakoxop.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/skdvtp2d2j15h1mtathcjfkgqq/tetezaf.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160989e7420194---7588191414.pdf
    • http://askort.pl/Upload/file/16017230392.pdf
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/dexaro.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7b5709fd088e0a144ba46b075f40b847/32665236273.pdf
    • http://sunrui-ti.com/d/files/11139211292.pdf
    • https://unosms.us/userfiles/file/nagafamogibupafusate.pdf
    • https://vijyaiprismcrm.com/userfiles/files/pogokefemajiladexujiru.pdf
    • http://nutronicltd.com/userfiles/file/18674624731.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5cec5f6eb---58186806843.pdf
    • https://ringid.vn/ckfinder/userfiles/files/pojademuxunupupa.pdf
    • http://taiwanglassgroup.cn/userfiles/file/poxezuna.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607704d889187---lukamewopudi.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4faa044b41---74401874117.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=really+cool+fortnite+pictures
    • 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_off00010449.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10449 16792 bytes
font_01_sfnt_off00011c60.bin
0fad69ad4d8dc595fc8a32e6951aac0037e12aabc6fa41f6c9c07af28a158d8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C60 10732 bytes
font_02_sfnt_off00013532.bin
910febf9c4985adff8673da52f6c51d09f400e03865262ecec40515981b28bb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13532 17060 bytes