Malicious PDF — malware analysis report

Static analysis result for SHA-256 85632229625f9f07…

MALICIOUS

PDF

78.6 KB Created: 2021-09-01 18:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 01dd8280802963b1dd50d7d0ac829cbe SHA-1: 0835835e21df8adaf8418204e28144dd99142c77 SHA-256: 85632229625f9f07de660fd56e5a8e581bc1014dd81857789b382cab03a9b1b6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9748e46b2---25635754207.pdf In PDF document text
    • http://ultraljud.nu/bild/files/tasifobedobewejobabu.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087b283dc212---41798944488.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/54281617888.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87081280929.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/f20291f8f614995dc82d9128d2fad356/89235437808.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/52be37d4950688534eeb60f3dda81a02/vegakopokitatelizifu.pdfIn PDF document text
    • https://honda-otolongan.com/upload/files/gafamujixajufu.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/3cteogh9le3r7260csjrfgj9n0/vefuketarepur.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/jozomowefipovi.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/6784681091393e7dd823f15c027e2425/najilewaxovumigabedik.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090802b26f75---gapuxux.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/zibitusafegakune.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/godavotakaxopa.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/1630023474.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95a9f40089---fogijadulalodideruko.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed1b2b19f9---wudejakiseposasamefepoz.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/jedojijejejemurebonagozed.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/gesuzira.pdfIn PDF document text
    • http://ca1970.com/clients/10044/File/10802666953.pdfIn PDF document text
    • https://majubesar.org/contents//files/47858759240.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/nobj0375o65oimjotqvota4s42/23943728289.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/tukuzotudulatem.pdfIn PDF document text
    • http://w-mill.jp/images/file/pafavudujatejuzotiwamakur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cet+previous+year+papers+with+solutionsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E8 16656 bytes
SHA-256: 40a087d83426eddf11116014842a32f1d105641781577eb59d7d138e4ef732db
font_02_sfnt_off000113ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EF 10748 bytes
SHA-256: ac5811f4e29df5af9ebbacc6117ba0649d8a5462d00d5ce62e5dbadb0e5695c7

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