Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8fe4c2a1f8e3b4…

MALICIOUS

PDF

95.8 KB Created: 2021-06-28 13:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2aa1ecdd67e7d664815720f23972a321 SHA-1: 286550f88f6144d40d6e1c7ee07bd4fcfaaf112b SHA-256: 4d8fe4c2a1f8e3b4a27bb6ae626e1f09012fb2e75c22e31222428b914b031b2c
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 and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, likely intended to redirect users to malicious content or phishing sites. No scripts were extracted, but the structure and URL patterns suggest an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/c0da89114986dcfb393b6d25cd284f0b/bukaganos.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/i2ecvqfb0ou1afej6tadtsosn3/66474304576.pdf
    • http://stasta.com/userfiles/file/kufokunade.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071f5f02a600---sitasiwixevufes.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af750458f60---2237474214.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/mi8n59visvkto1aq7uine0vef4/93778527723.pdf
    • http://gocreate.termall.pl/upload/fck/file/valubola.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160986e4672ca2---lurolibavanizaxu.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/acf7e4acc721bce0595bd2405efbc9ea/zupig.pdf
    • http://bulk-supplies.com/userfiles/file/62267966375.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbb9f04b13---zekazinomufewutefikikagan.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/9i1rbin0e5mcldk7eajggl3125/12854524801.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d40092b11---92023763147.pdf
    • http://albino-pitti.com/pub_img/file/befirofotawalupur.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d6be66a8b0008666ac348bbbf488c72b/mutikavowoduzifojazet.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160afa329048ec---14472643618.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/77ca56ea6b68dbf70a95d26408f8a8c1/33969925374.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d334a5c6b---82239280220.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/4ma55icrft24jkg59ui4kv2n3a/61763784574.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160831de673550---zazomijakoget.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/kph3sqomp421mctmhsmuqtpvkl/8842228638.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/k61tfg415h28j20pmhha53j0ug/nedidulofapazabebug.pdf
    • http://pritchardreunion.com/clients/81409/File/24872512558.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/dkhathdm8f9qgtopc2k7ehhsdn/41622387890.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=hilarious+answers+to+questions
    • 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_off000115b8.bin
7428c0341ce1aeaeb73a33f2052741f750acf67e931335a02f0bd8c31bdea77f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115B8 10424 bytes
font_01_sfnt_off00012d7b.bin
f5ff7020716999f968b5557ecd459fc413c68bdd7bde1560b6a9277d9a62c5f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7B 16676 bytes
font_02_sfnt_off00015880.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15880 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.