Malicious PDF — malware analysis report

Static analysis result for SHA-256 908040f69d5fa18b…

MALICIOUS

PDF

88.7 KB Created: 2021-09-01 20:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 3014b5e0b433cbef4916e925409afd83 SHA-1: 8dda4a2d98ac07d7bb8145d2b273398621498e89 SHA-256: 908040f69d5fa18baad2c443869dd359690ebc013d78b7fbd05dbe756b225557
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites, indicating a link farm designed to host malicious content. While no scripts were explicitly extracted, the nature of the link farm suggests it is part of a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4052b901b2---dozaxasapaf.pdf In PDF document text
    • http://yasaitogo.com/uploads/files/vatimosemopokukosugewekot.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/69151356349.pdfIn PDF document text
    • http://chengzechem.com/upload/files/pudadakojulisakaweva.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/pifotat.pdfIn PDF document text
    • http://vititanon.com/user_img/files/nemikikajebaxo.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/r38vfd725d9jkgci81npu30603/98929404879.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/galolijisamuxol.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160f56912d737e---geradirolizedaki.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/86441264996.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/wilovevulivumetozeke.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/48599157432.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/73962603447.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607085b907fc8---zakagexeginedelofez.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/ojnjhkhfgbpaobv5odvj1f35a0/tifunibeni.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/gobpmuvi9msaum73oaemg2dmea/90713581008.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/tevamezojarot.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/lomimipo.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/26922417125.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8278b9713---6591932865.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/lumul.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/67658883125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=saponification+in+soap+makingPDF 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_off0000f7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC9 17856 bytes
SHA-256: c521f30720ba6a7071b68aa75f365fb9a0c4130dd982e504d2d6165bf80a3529
font_02_sfnt_off00013e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E14 10712 bytes
SHA-256: 3eca3de00db5a5e848c0bdd849fe71fca1ff3a22454a2afbf23d74be7b8c91b7

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