Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afc125afa2caa5d…

MALICIOUS

PDF

83.1 KB Created: 2021-06-25 13:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0e885cc2c6d0d76e54eac60fd0bc79c SHA-1: f7e18d7bf9b1295fc953b51d5c7542d824d59585 SHA-256: 3afc125afa2caa5d754c2f3cbc59c4c6b0f50a15d1b6fff98699955eb90263ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm or phishing lure. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948462a598f---zevidufilimej.pdf
    • http://amandatravel.com/userfiles/file/14758244794.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c6a857447---lovoretipisagamepamomekos.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/1623b7f7348dffa88543807b9cde1283/85453191238.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1296184075---zotudusudozetoborar.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/2825245f1911810bc52b23932cf71e0d/gibovigakofif.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/tbld66qhoc88lp58hftjuu30ul/rudobesukodurujaw.pdf
    • http://doyen.cc/images/upload/File/pulunininek.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762538084ed---40912422381.pdf
    • https://istocdukkan.com/userfiles/files/xiwovufig.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608460e0dec6a---mumakuzulozawijiz.pdf
    • https://diedacorporation.net/freesiafiles/file/44903741865.pdf
    • http://train-in-japan.com/images/blog//file/12240968677.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/3fg3jg00o9uf7tmnrq03eu4km3/37760676185.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab1dcd79e2---68127793559.pdf
    • http://2ds-creations.fr/userfiles/file/92308206278.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=biogenic+xr+before+and+after
    • 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_off0000e10d.bin
57334c30624005109b0dd22daefbf4e777f70992136a36849dc33a63b4494a59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 10732 bytes
font_01_sfnt_off0000f9af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 16792 bytes
font_02_sfnt_off000111c1.bin
d501f3f02b18426b036da1f03f86148b655793a9df682474f062290f2256c6c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111C1 17108 bytes

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