Malicious PDF — malware analysis report

Static analysis result for SHA-256 014f3701dc53f7a5…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 06:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c90188db6702ad315ebb1d145fbfc9c SHA-1: a7949892f8f0744ae88f3cab4bf8c2f722af0745 SHA-256: 014f3701dc53f7a58705185a0b646bdcebb3677945e7750694cabf4aef91c65f
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, with a critical detection score. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160975edf4b2bc---nagirofiz.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612969191b4ed---93986473382.pdf
    • http://aotwresort.org/ckfinder/userfiles/files/24717973633.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/21b962f5625eeec8d6e040cd31d79612/15918710696.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/6fohui401u3b6j20eonqa3f5p5/rajam.pdf
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24471587289.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/864fbdc1a25828a5016fa4f49756d1fa/96318903026.pdf
    • https://aiaciran.org/cache/fck_files/file/pudozomutotirofavedegep.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ed480393d---19405110300.pdf
    • http://surausa.com/uploads/files/tategapimudusekikofi.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ff877f2e0---retemida.pdf
    • https://caror.hu/ckfinder/userfiles/files/44937137415.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/16ae021ea19ad32177d3db856491215f/69937604883.pdf
    • https://amoslodge10.org/ckfinder/userfiles/files/taxuwepelukudatuvo.pdf
    • http://zafirkort.com/uploads/files/degazekotasododeleputa.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095e5178d3b5---72112556823.pdf
    • http://selidbe-beograd.info/files/ludalinibagepugesoted.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/faa128995430419b0464a23d917fafcd/ruxidatas.pdf
    • http://vitalenzyme.com/uploads/fckupload/file/13252315132.pdf
    • http://hillandbrownfamily.com/clients/76964/File/1275911241.pdf
    • https://anthonygillant.com/userfiles/file/14375923348.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160764e18bd269---33555710084.pdf
    • https://tedesco.pl/userfiles/file/40494869898.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/d1c5a0f495b8ad878bfaaaa53a96b39c/4855766858.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+save+word+document+as+pdf+on+mac
    • 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_off0000e049.bin
0b8b5e1b71180f9a49d3ebcf533374d071f0ccb150c91c683faa6ad434a4e89c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE049 16796 bytes
font_01_sfnt_off00010bf5.bin
801077496af381e5e11358bccf82274d47d18af032b54e2ee961d8406682647e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF5 10888 bytes
font_02_sfnt_off0001252e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1252E 16792 bytes