Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c7c4961103ebd6…

MALICIOUS

PDF

86.9 KB Created: 2021-09-22 20:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e04984959c77e083884226cbca42d04a SHA-1: 7ba4a11e24f7ca01cab9b808d7b069b48f8cc70e SHA-256: 92c7c4961103ebd69848cf12f7e61b4dd1eb1f41d4d132b5e01a5eacb49cf9ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of link farms designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=android+player+for+laptop PDF link annotation
    • http://houselandia.ru/files/melewajafimufaguvevizif.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210901_161912.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/lavosos.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/donojubavi.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161326e7104bb2---7212220976.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/gilujobiwonusenal.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/78361931891.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/satasuzunamu.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/88223992315.pdfIn PDF document text
    • https://cristalensi.com/public/File/74435422019.pdfIn PDF document text
    • https://aayams.com/userfiles/file/1746229784.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/guzesijobin.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/tivukumonezu.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/jotigosowexupivu.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140ffa2b0844---90661515976.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/fivibowomodeximovazibafo.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136689217ffb---31524662096.pdfIn PDF document text
    • http://gurmanosypsnys.lt/userfiles/file/tigalotuzunijadafoze.pdfIn PDF document text
    • https://mytopics.it/uploads/file/lesum.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/turivokiziwi.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/soxosojonerabow.pdfIn PDF document text
    • https://activepymes.com/pub/file/xebok.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/37230545751.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/92102701206.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_off0000eeba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CC 18200 bytes
SHA-256: 1d73ccbe89c263545b17f0e17e1d86d031f95a463ab4923234e924663a49a67a
font_02_sfnt_off0001361a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361A 10416 bytes
SHA-256: 9205c5e0c92f49208c9e6e1d575260f059cff6c824c11dd467f8fd83a4c81bc9