Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5cf1148962d6141…

MALICIOUS

PDF

68.5 KB Created: 2021-09-27 11:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2a89c4476bf4a36c5170a0c8a91cb342 SHA-1: 3346b3d0401e580c5b2a30f36259713a908c01c3 SHA-256: f5cf1148962d61411ee7cf9569074397d3a1aa70b8baf3d5d1a6e869d8b689e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to lure users to potentially malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://irlanc.ru/uplcv?utm_term=use+smartphone+as+webcam PDF link annotation
    • https://receptabc.hu/images_banner/files/sisunapexoxodoxubifakon.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/piximaxezoni.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/jafigotuduxigigifolo.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/66389703747.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///93986981021.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139349aabd08---66487660259.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/podepiwalaxapojadajoba.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/36470113756.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/tozikijusalonikotigagod.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/90548280012.pdfIn PDF document text
    • https://apelhijau.com/contents/files/45967154106.pdfIn PDF document text
    • https://mauspro.net/upload/files/27591014299.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/1908933272.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba58e21d88---94758425817.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/96813204335.pdfIn PDF document text
    • http://szm.hu/userfiles/file/susovomap.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/dekumamivavudamudelifi.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/15151591845.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/widufukidudonosat.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147108e10374---65830728400.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/karetexotanamulewu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC514 15492 bytes
SHA-256: 8a9deaf60036be1b65ab68961649eb04d72ebaa55a34e4ea1129664f22ee7388
font_02_sfnt_off0000ec47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC47 10736 bytes
SHA-256: 645adcee1e3d1cc79dd664136bc6bf91fa246f17c8542cdf12d439d077adbfba