Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4a3c772305b7eb…

MALICIOUS

PDF

83.1 KB Created: 2021-09-05 05:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fac879b79e18b95635250ae833dce1b3 SHA-1: 83c5a84d74a91c59d0e780e4ca87204fa294b99b SHA-256: ed4a3c772305b7eb81e206c08a6d0b2f5db3577d967f4bdbac9299a90671d72b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious or compromised external sites.

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 http://dobrasekacka.cz/userfiles/file/66861798440.pdf
    • http://allaboutdowney.com/userimages/5162970866.pdf
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/34118287828.pdf
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/zamotiroraze.pdf
    • http://schokoladenfontaene.de/idata/79081375652.pdf
    • http://sahrugs.com/userfiles/file/vutelazu.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072224f64b89---98130514014.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16107ead0db130---dizutajetewesowalazabut.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/93ca698c892a77cc01331b0bebd7b228/xatizenozudibulo.pdf
    • https://schmitz.cz/res/file/kujupowoporelet.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e639a531---85456058009.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/84a3b265f1d840d2806f0307a5df66e2/62908448504.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3cfc05478---fejevekogezopawosimame.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1ee318f57---kukibapomisasuleso.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc394460bd---kujevenozowavo.pdf
    • http://enotecagaribaldi.it/userfiles/files/48399070572.pdf
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/mijolutunekelesix.pdf
    • http://daoltrading.com/userData/board/file/medunaravuvaneki.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f64fcab14f---folirovawasozakufuzuv.pdf
    • https://ccaquebec.com/userupload/files/17619391284.pdf
    • http://agnieszkapawlik.com/userfiles/file/71423319294.pdf
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e6c8b5c08---mutopubebeguzipan.pdf
    • http://balogmihaly.hu/UserFiles/file/bajoputimalevatepar.pdf
    • http://meteosputnik.ru/userfiles/file/13282121676.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=toefl+exam+2019+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_off0000debc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBC 16792 bytes
font_01_sfnt_off0000f6ce.bin
5070eb9760ab891aa5c89ad2342931cc98eea4ace76bc20e1ce130a949d38f96
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 18384 bytes
font_02_sfnt_off00012644.bin
998338f4c687a177cd283138a6b77e235da1544e6fc4d549c2b4fdb4ca2ee0bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12644 10624 bytes