Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9b025a713359e4…

MALICIOUS

PDF

69.9 KB Created: 2021-09-09 00:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6728ecfc4aebf9ded7020bd93a116fc8 SHA-1: ac0018573c1f0d7290f5caad7ed83f2a07f0b084 SHA-256: 1f9b025a713359e40862ed4f896b8803c5ee2b9a77e84434a310ce79d2eb94b4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to various domains, some of which are associated with compromised CMS uploads, suggesting an attempt to redirect users to malicious content or downloads. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the phishing and potential malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kcharp.com/ckfinder/userfiles/files/lewezisatizabizasej.pdf In PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/jibijesosebenaxu.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/71829234288.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/77666475847.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/tigogenusuvanuxama.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/zewifuvijapapevitamewuma.pdfIn PDF document text
    • http://trieuduong.com/images/Download/18850122669.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/42641042885.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/96999578605.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326f7d3adb2---makag.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/01550a4874869baa4ff2e40ea17eada4/73761794758.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/3246940851.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/tanulabidezufeve.pdfIn PDF document text
    • https://photojet.net/userfiles/file/korepijapubumap.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/sewit.pdfIn PDF document text
    • http://changjiujz.com/uploads/files/202109010651301280.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/89231332033.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/73443661508.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/gaxozufavozafanas.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/6k2h1l57uh0pp8hfifrc631d5b/35745185291.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/34997614138.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/5ac767673027fba748660a8073929683/36497117687.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/mamoxijazupewofos.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/lokatizatawa.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/laluperumeniziti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=lightroom+cc+premium+app+downloadPDF 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_off0000b490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB490 10936 bytes
SHA-256: 8c9aad244727a23777bb46d225455ccd7569ec76ac9d5d227eb533e43fc4f176
font_01_sfnt_off0000cd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8F 14464 bytes
SHA-256: 6f18a49af0f9ea4198dafa79f34f898a4313dafb75e8355a1d2ba439074bdc13
font_02_sfnt_off0000f1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1