Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79cf438d06415e8…

MALICIOUS

PDF

88.9 KB Created: 2021-08-12 11:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dbac654b9062f0112bd81ed727ded5fc SHA-1: c754a3518920741cc8d642ef5be67d48afbc97c2 SHA-256: a79cf438d06415e8c46b843745c1529b35790aed89d134f00082363f49c5d97d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall structure suggest an attempt to lure users to potentially harmful sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://irlanc.ru/uplcv?utm_term=how+to+solve+matrix+using+fx-991es+plus PDF link annotation
    • https://nepalipublisher.com/ckfinder/userfiles/files/repabuxepogoxunomosinex.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/d9f49436a8ba750cf1239d9517bba4da/bedodadusutuba.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/546771c746250730f62b9e0dff2aa670/sulemafesuti.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/voroboboxobewa.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/202172524156.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4cd071d68---sisaxugizodolow.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/14815421954.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/4540f24b9abd68aecc5cb33ab48d4579/puruzozedowubaromib.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/sakij.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081eb50513be---36345294480.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/43671439951.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/598812767.pdfIn PDF document text
    • https://brs.jo/userfiles/files/vubuzadekazududirenod.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f726bc1b24---98631038035.pdfIn PDF document text
    • http://phpirateboosters.com/clients/867602/File/7366920503.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607424e6daaaa---38842151747.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/lodenewopojunapamafenub.pdfIn PDF document text
    • https://avvocatoboretti.it/file/81238445222.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/dosut.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/miribomanaririfaberakade.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/36835430872.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16082a4ec128a1---42070111424.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/letiximopiridupusod.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/ledalapuguwuwowupub.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/17316307845.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_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 17756 bytes
SHA-256: 97fa08967194d6a120bc90c0362de5144948e154f2b82de212d160d1a6eb866e
font_01_sfnt_off00012216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12216 11300 bytes
SHA-256: 8c2f6cbcd6b50374c7327da068606fff20f633481ec762875f2ca113475343bc
font_02_sfnt_off00013ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1