Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4418453f7ebc871…

MALICIOUS

PDF

95.8 KB Created: 2021-08-16 19:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f40d5ecf4e281e24e9f24b0c20bef9d4 SHA-1: 1e973d9035e04f6958308d645fb67b037a173d06 SHA-256: a4418453f7ebc8715b7e4bca2ef01191647369202fb8688b0f4c05b8070b6f39
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating an attempt to distribute malicious content or phish users. The document body is unreadable, but the heuristics strongly suggest a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.abcklima.hu//data/editorfile/74605874101.pdf In PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a6d9e8d68---puvoxoviboguv.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/xogokajedasixureda.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/24099880710.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/72373338252.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/0dvm5h79r33fmuh26c8v539h47/watovuputexuwepadolosevap.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3d259c1ac---65842172380.pdfIn PDF document text
    • http://peaktoppet.com/ck_imgs/files/xemepebo.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/dead32bad73d5ebe75b5df08cab83e3d/wopijirijiragomafigo.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/46127277757.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6284bc1846---kasajepamorabuve.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e33f535061---getomopefide.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d491aa52f6---tepivokutare.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c4de8363d---kekazomuluko.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160727f4978922---ronerojolanazezitetixe.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/zapowimifojufuvirimol.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/7614280869.pdfIn PDF document text
    • http://amandamaitland.com/images/file/35902045974.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/joziwiwinilasuxodi.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/36120188743.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ne76rotnl7683qh1rkl1cnic85/77706356500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+get+ultimate+trolling+guiPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A12 10460 bytes
SHA-256: 2623d6f605ff41720616a9a4fed0d026ea44a042be06becf1031892712d71cd2
font_02_sfnt_off000141cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CC 17660 bytes
SHA-256: 8e851199c6a58698e5d408262482bf74a9bcbe5e9ddd54483400ca7ecbabd88c

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