Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6853a5d29a19737…

MALICIOUS

PDF

94.7 KB Created: 2021-08-09 22:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 53cf4fbfa81cf36c77f0a1eabe8e5365 SHA-1: 5b4c38273382ead3eb3a685f58af363547e9113c SHA-256: a6853a5d29a197373653cea7f570bc7e14399a064b204b01e85491d3d5fa8c4f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The file contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content or exploit kits. The presence of multiple external URIs and link farms further supports its role as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://royalwedding.jp/images/blog//file/87826034224.pdf In PDF document text
    • http://versobrokers.eu/userfiles/files/95829730243.pdfIn PDF document text
    • https://agatanorek.com/files/file/83978134497.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609957e2bdc72---38037020277.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/13929855256.pdfIn PDF document text
    • https://olterus.net/contents//files/xukokimowax.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608223a9cb3c0---bazabijomodofelugulupu.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/rujewenajaziborejatukuli.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/527a0ff755eb8df116388b3691960191/keretutawejokufabe.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/426dccb4ad703641dcb2cc83eb6546c1/fevabigomusosijow.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ca49dc26cf8---93196096623.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607077864c637---zawezipikex.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/pakabuvu.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/g0a12k8l3jn3hd87t236vo4537/wufala.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/vupodoxesubevexumunozu.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/6498f2c3abbc32cd45c4d4982cdcb04f/49015513409.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/dusoretizeregi.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a870b269850---zowebufuzedesasofugedowa.pdfIn PDF document text
    • https://jobtiara.com/files/files/jeruvawisule.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a194b39cdc---wepofonibe.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a394e126d2---16632398362.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071a5b822db5---pibiribizo.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/bevup.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/luwudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=d%26d+player%27s+handbook+epubPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000cc90.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCC90 18428 bytes
SHA-256: d9536d663ccecbe62003f54334dc0df9825c0d1cdb270ef67e79c793df8615da
font_01_sfnt_off0000eaae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAE 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_02_sfnt_off0000fd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11565 28416 bytes
SHA-256: 5d1f0aba2c88804277cbc66521d12656fa635c61de40ca35d06e70a8529453b1
font_04_sfnt_off00015b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B3A 4108 bytes
SHA-256: a59f91f28b6d3cd1f944f041479d2de445cf56eb55eec9ba2ca9eaf0aa9dac67

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