Malicious PDF — malware analysis report

Static analysis result for SHA-256 658f562677ea9e18…

MALICIOUS

PDF

79.1 KB Created: 2021-08-14 23:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 89070a64af47ccb8f252b9efe3064b22 SHA-1: 018b0a40fb108b266c736c10b063a452e82e4281 SHA-256: 658f562677ea9e1882edd1685f48cf8928dc0db59ea4dd184e4011e0059c4fde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a link farm with numerous URLs, many hosted on compromised WordPress sites, designed to redirect users to potentially malicious content. The presence of multiple external URIs and link farm heuristics indicates an attempt to direct users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crysiq.ru/uplcv?utm_term=mecanica+vectorial+para+ingenieros+dinamica+10+edicion+pdf+gratis+en+espa%C3%B1ol PDF link annotation
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/d3050b3fc165d6e292373c351a55a555/33743423161.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210701054608081630e22ii.pdfIn PDF document text
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/jegozebixurigisike.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091f92c4b14f---27838063662.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/f65ac6d423f4efd49eefe2118f83f135/dajexilokebojidenetu.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9a683ceb14fd1bd245c0599d8c43232f/20038903775.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210604_2D4E475FAE3D8494.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/7429844603.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/vobarexasuribifexosonirit.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/34f507199785d6fe1a2360f6acef25f6/97609702579.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/turinusiguvew.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fef6be3be7a---gibazuvovufefopen.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/30d5e708ba170606a8c406f38ac5c02d/55593155287.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/62e4f1d4472bec554a634ab7d6525d6b/nawexa.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/04340ec44ed76a1bcbd1f511fba1685f/79681099193.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/55060527839.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3539ef111---88791516694.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e22fce642ff---66314970717.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079a73f04954---57415108236.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/susunulu.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/rigizebunonaxa.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a2784ab48---laxatudolakigupo.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_off0000cb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB54 11404 bytes
SHA-256: 125486e8169b9143a03643861e993a8f0aa4d2fd4eb5dcce7df745f504dc9e50
font_01_sfnt_off0000e5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D4 17616 bytes
SHA-256: a02f37b096a2b55e79ae0d55e6dcb3d228f9e926cc6c7d17062c131e930fc688
font_02_sfnt_off000111ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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