Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab888ceb49d9bd1…

MALICIOUS

PDF

82.9 KB Created: 2021-07-09 03:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0b219f040090ad053abb089d2d14a2c SHA-1: b63e1e6a9510f36399cc5ed0dcff1ce259ff0e1e SHA-256: 9ab888ceb49d9bd11721588e69e387711796b05363d304e20d78d81b2b00e333
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a54425c7234---dotifejijebutulekefa.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/85f95f85147599a03713a57ca5076481/ximoxonax.pdf
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/juwajalazozavorukam.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b90e0ce003b---74886253672.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/07723df795e056b33336e7f0100c24b8/guvusetivodod.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a4ab612af---bamawozo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fafda14f8---54303654702.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d28521bba66---78547773852.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb31178c890---fixekolotusutitelojeloti.pdf
    • http://aliceinformaticasrl.com/user/pages/51901551884.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608561d8f026e---tosakaradexipubuzab.pdf
    • https://marblobaths.com/app/webroot/img/files/nogetakogavuxivekopif.pdf
    • http://ligneus.hu/upload/file/jekonasobonusotusatoman.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/57290ee3e2a24cf4118fde0c1b6efeb9/rotufas.pdf
    • https://aarhuskortet.dk/images/file/tamuvaxikiwazutataboba.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607007ebd4221---sadedun.pdf
    • http://casier-a-bouteilles.com/file/lozugubupamademenavit.pdf
    • https://agatanorek.com/files/file/turelixisefoxusabup.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088b15072b3b---lubodadopubabegidiwexoseb.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/004105728aa7a53b1ae8d5106b79a2dc/lerefewerozivowevelij.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab5ad206b0---baxixadedu.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b20b3f1e0---mejonenivenunuleribob.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=infosys+question+paper+pdf+download
    • 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_off0000e0d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D8 16792 bytes
font_01_sfnt_off0000f8ea.bin
51a8251bed501643c048c25f63285d5f28eee59718cf0d6662801cd1cf2bfb28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 16976 bytes
font_02_sfnt_off0001253b.bin
65702496a24b5f358d6d078c41f818e1cd52d80137200aed9326303485fa63b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1253B 10888 bytes

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