Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35e65deca34a00b…

MALICIOUS

PDF

184.8 KB Created: 2021-06-26 12:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 569eabae426fd9f1f8224b79a0aada96 SHA-1: d8a43713aacee1a2598aad06ba9bd84b56f60b02 SHA-256: a35e65deca34a00b34b3343201b39538f5410f52cc8032590e182bad39ae4229
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9631

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://irlanc.ru/uplcv?utm_term=how+many+inuyasha+episodes+are+there+in+total
    • http://absolutelyneon.com/userfiles/file/95379698587.pdf
    • http://ajisushionline.com/uploads/files/jiranenonurarivudo.pdf
    • http://snsi.jp/image/news_file/3141505668.pdf
    • http://deborahbrown.us/clients/860103/File/65496841486.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/075abe55bebacdb75e1988bb36e3dda2/warasup.pdf
    • https://infrastone.com/userfiles/files/gitokanuj.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160889112cac13---90566796488.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f85f9ef2f3---webaxirutofagijigi.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c03bd1d5b8---nipogejenesodilaziwuzi.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/b8b6d7dd6e6a0434197606894c091a9e/33538872509.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/0bhva0os7l2quotu4h8flf5th3/90579480437.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/g75e3v5lind8tksu8solnuvv02/62388824797.pdf
    • http://centralcogtc.com/uploads/file/88566703347.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/ps85ucuv4vnu4h5ngob8mt1635/28399178835.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160be3b7f9e98c---mufufilovozagadut.pdf
    • http://work4shop.cz/userfiles/file/3936748385.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/c3083554e3ae6c77f2152498cb2c4b42/4401322170.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/93131460860a7eadb25d38.pdf
    • http://954move.com/clients/4890/File/97759578229.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160943e449d3fe---ramifabivi.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/i6m3h88qk6no0md1m3vmugp7sm/72497534165.pdf
    • http://sunnysolutions.it/uploads/assets/file/58384279422.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/7f4ec491fb19c008b71d4232646f0a3c/rajupunowesup.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/71a181bb0a772d1088fa108030577c9c/61717668719.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000165c3.bin
80956237f20740e9648e18cefafc7284e87a9930ec8aac9f22b2d644a09f1a6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x165C3 106932 bytes
font_01_sfnt_off000275d4.bin
56bfe1c86b3948ded02ae35a56f0bb689723393fcde463eaea0307df71ebf291
pdf-font-stream PDF embedded font (sfnt) at offset 0x275D4 10948 bytes
font_02_sfnt_off00028f06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x28F06 16792 bytes
font_03_sfnt_off0002a718.bin
ce92867a2b4112a1dc500e25e55e3e5c0531543911e53d578cca10b16209059b
pdf-font-stream PDF embedded font (sfnt) at offset 0x2A718 17848 bytes