Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b79abb5b062bef…

MALICIOUS

PDF

71.3 KB Created: 2021-10-01 00:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 206df90e6aaa806a23092676161b3b15 SHA-1: 0936fc77c0fba15706a5b4e01df8d715bae127ee SHA-256: d9b79abb5b062bef5f8caf932512fc8fac09cae689104e66835b93d9eded40f1
176 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, and also includes a heuristic indicating it instructs users to scan a QR code. These elements suggest a phishing or social engineering attack aimed at tricking users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://melnikhouse.com/userfiles/file/9575085932.pdf
    • https://maintogelonline2.com/contents/files/fegidefovaseme.pdf
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/77743013489.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161407aea1ec9f---87201574089.pdf
    • http://realcomfort.ru/content/upload/file/foxafaxiwoj.pdf
    • http://lednotice.com/userData/board/file/52385483555.pdf
    • http://giahung.tincorner.com/uploads/files/jiveva.pdf
    • http://espwireless.net/uploads/file/8040911076.pdf
    • http://pes.edu.mn/ckfinder/userfiles/files/90066726723.pdf
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/17599047493.pdf
    • https://at1apigroup3.com/contents/files/tobutaworebuziku.pdf
    • http://dentalcenterstudio.it/userfiles/files/87346162342.pdf
    • http://wideanglepackaging.com/ckfinder/userfiles/files/21771194440.pdf
    • http://carrozzeriardue.it/userfiles/files/62924271861.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/9636f1528863ad675323bdb88292a502/jovakiwulebito.pdf
    • http://neboskreb-irk.ru/uploads/userfiles/files/92593293750.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f09e0adfdbbc8a573f0ec8cb7b188c7/10132934044.pdf
    • https://administrador.bannik.com/benkio/files/xegarujijitusu.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16155cb5e5b1dd---detalaranepudakemizuged.pdf
    • http://popmetre.com/news/files/54056963937.pdf
    • http://easyliveconstruction.com/ci/userfiles/files/tuxotinosujipizogasufowu.pdf
    • https://molecult.metallo-tests.ch/sites/web/upload/files/rekokexetuzefovazofunem.pdf
    • http://vocal.bpv.su/content/files/files/58152065142.pdf
    • http://potlista.com/file/files/17789811687.pdf
    • http://tfe-design.dk/userfiles/file/46831656715.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/69422eda5c6372d8c9a7d9e734d111c8/pedikegobuwemidepelesudug.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=download+qr+code+scanner+app+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F3 16792 bytes
font_01_sfnt_off0000cd05.bin
97f2dc9635cdd15dc48ac3dd65927876a5f40daa1a3666cb564a537eadaa8c6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD05 16228 bytes
font_02_sfnt_off0000f682.bin
ddf9ff71175db21b736a0937c61c23bf178cb9d5ec38c3d92f01e3a2175c8507
pdf-font-stream PDF embedded font (sfnt) at offset 0xF682 10748 bytes