Malicious PDF — malware analysis report

Static analysis result for SHA-256 072a1ff61b535a3b…

MALICIOUS

PDF

71.4 KB Created: 2021-09-28 09:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: dafce9de8bba1afd901ad76e4aad1d71 SHA-1: 57b718084de6272c048a1402a756a9fe82b52f28 SHA-256: 072a1ff61b535a3b6e581cbc8ff1d45cf79a00ee00296f0bc3a24ba9b41a876e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to various domains, likely intended to redirect users to malicious websites. The presence of multiple external URIs and a link farm structure strongly suggests an attempt to direct users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://turinimoti.com/assets/userfiles/file/wepedexomokatu.pdf In PDF document text
    • http://avvolodin.ru/upload/file/talexelulewugozibuni.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a143daa0c7---jifazovujemigugujazawudaf.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/nawevurezejubak.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/5djua69lket34bdqhp44g30ac3/pelexiluzumoterowimudizo.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/73644289015.pdfIn PDF document text
    • https://saya.ro/app/webroot/files/userfiles/files/955745167.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/89983337000.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/58927240389.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/99519648353.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/80515300724.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/2867985870.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/67354691334.pdfIn PDF document text
    • http://allier-genealogie.org/File:/buzesifo.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/77151278766.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/91113065914.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/kesunuteza.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/31880670521.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc5e901f0f---93019360017.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/b656ff2e4452721787d5c3dcc15db8db/javikupemenaromup.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/47472118639.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/jizagu.pdfIn PDF document text
    • http://heizler.hu/files/file/73420835921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=fundamentals+of+physics+class+12+pdfPDF 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_off0000b23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA52 11148 bytes
SHA-256: 785da973500227b11ae34c553fb13d4a75fa6dc7ea5014d560975b63a539cf58
font_02_sfnt_off0000e444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE444 17144 bytes
SHA-256: 75fcdbd801df539e9dac97f1d93463f5db24fea6bdb44c8cb54a1778342d6a5e

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