Malicious PDF — malware analysis report

Static analysis result for SHA-256 6033a5dcfe28c492…

MALICIOUS

PDF

83.9 KB Created: 2021-06-27 22:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bf8d53a66d98bc16ddc445a5e5953520 SHA-1: e18a71211d6bdbf04b6a682ec5f1cc3e7c3170a6 SHA-256: 6033a5dcfe28c49250e3540da92063412861979328212528e86555e6240feffe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are indicative of a spearphishing attachment, designed to trick users into visiting malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://medvor.ru/uplcv?utm_term=how+to+write+an+email+memo PDF link annotation
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/38e3499de687bec70a707720ece2c5fc/10525493676.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083943f49145---3802261752.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce5f7e8c33---9516537295.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaed158f75---61532948502.pdfIn PDF document text
    • https://coil.hk/upload/files/48351887415.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608856abc1711---29455560116.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/75282267983.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/zilubirasigin.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/63104651066.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/su4q25r9kg2n0chof66v0okn0d/72364831801.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f1fe2029d---reromoxufanuxorumikaxude.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/224e6a5ad5f0a900bf326848d4098698/87872087631.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/958fe7c1a42b8d41d0572c84e6f05979/zupajamalosoxajuzagaz.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/53089269362.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789b48f0617---17847402349.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca6a2403ce---somukepuduseduru.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084939810a21---jigazaleg.pdfIn PDF document text
    • https://unosms.us/userfiles/file/54809158524.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a85c05219---23386774690.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4e1e1df3a---89502359590.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609be5e726a4f---neluwopusuvo.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE676 17448 bytes
SHA-256: 2171819085074c12c7d41bdcf57c2ed597a6eb7dcc3bc34ae54e3e51f2e7290c
font_01_sfnt_off00011431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11431 10176 bytes
SHA-256: 40d5e7f719d3ce3b8a8170787f79841ba13665c9d96cbb32b300cfeb25c70cbd
font_02_sfnt_off00012aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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