Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a8b009cf76d5db…

MALICIOUS

PDF

74.7 KB Created: 2021-09-04 02:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 661ac0056bf1d8c707b9e9cb11f8b9bc SHA-1: a61f605c4c70437f7596b7d394ac3a8ea0caab58 SHA-256: 61a8b009cf76d5dbc915e5e4d8064f3eca446c1823eb2d772e3b380da058898a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and disposable hosting sites, suggesting it functions as a lure to redirect users to potentially harmful content. The presence of these links and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://artpolinakuzina.ru/pict/file/xuketimegaveruvibofodurur.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/0725367196bb38796147509086d53477/71544434108.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//82429871876.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/41f1fa9c8277c64a8949841b5e65549f/75280980177.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/64853ei4v171afvnm68v15ubsv/69474052426.pdf
    • http://duda-tech.pl/dudatech/upload/file/zadudaragarotoriluguf.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/c1qeh6no15v8u3pjv6kmpv4hv5/51422212685.pdf
    • http://iberia-ex.com/images/blog//file/612326902.pdf
    • http://whuntex.ru/userfiles/file/69502922345.pdf
    • http://techbico.vn/uploads/image/files/80814125876.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f6a878969---xixipewogumorevixukoke.pdf
    • https://voyageaventurenepal.com/upload/files/fezidutogunotovexoludus.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/f54a1fb0793152e91e306e96a21b6f65/83639075943.pdf
    • http://ticaproduce.com/ckfinder/userfiles/files/xixesososebilora.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/dda9febd3eb6277382d5027247e65f53/19326655222.pdf
    • http://hmconcretemixingplant.ru/d/files/dukelulab.pdf
    • http://csc010.com/userfiles/file/20210626051403_kizd3m.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/8aa53ae47a4fde569ae00a6e8fb946a8/28818131899.pdf
    • http://cerrutistudio.eu/userfiles/files/34950835801.pdf
    • https://rheinfurth.de/userfiles/file/tufegebelebidalujawon.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cafe6b6728a---pixixurojudivo.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/hsfo6n7gsjfa5p5jsrdcvtgjh4/puninavipileni.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ulco7ftbrhsk81u5er3scvjve0/72462776564.pdf
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/60782390058.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=aman+movement+anti+ragging+form+pdf
    • 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_off0000be0a.bin
a0bcfd70a2f387cf2aa4cfd19d7828188b6e26b642414d6d39313c754bcc8959
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0A 10676 bytes
font_01_sfnt_off0000d64b.bin
00a117ca329d935c8a7fb0efd5ba028c04d88262ca20d9df15f61bdc42266e48
pdf-font-stream PDF embedded font (sfnt) at offset 0xD64B 18172 bytes
font_02_sfnt_off00010529.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10529 16792 bytes