Malicious PDF — malware analysis report

Static analysis result for SHA-256 d444b2d5c193c6f7…

MALICIOUS

PDF

76.5 KB Created: 2021-09-04 11:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa56d2e34c5a30985abcb82bacb3d503 SHA-1: 451b656d72460a34b878e9bab1adfb733113e331 SHA-256: d444b2d5c193c6f7fbceaa35d07b500933be8d92d7082d9add6f5b32a6faccd5
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised or disposable domains, suggesting it functions as a link farm. This pattern is often used for SEO poisoning or to direct users to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://gifarlcm.com/upfiles/editor/files/42585442097.pdf
    • http://pogservice.ru/userfiles/file/dolapipekufiral.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f683b7cf7f---2087986482.pdf
    • http://phanbonvbm.com/upload/files/33372125811.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607764b118a14---busanavelaposevemopojebeb.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/thbj6766i9kchcp1ne7gde44j5/mupaz.pdf
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/90385965600.pdf
    • http://studiopedrazzini.eu/userfiles/files/5042102988.pdf
    • http://yingtailong.com/upload/file/210823174316257587gwb1eg87vwla.pdf
    • http://www.awakohchang.com/image/upload/File/ozisozesepivenujevejibaj.pdf
    • http://doubler-son-capital.com/photos/files/peruxukanetofupu.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/a7pct99naef56hudfhhprv8r70/xovikedu.pdf
    • http://kapsalonindex.nl/images/uploads/surepebazasadimafunob.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b5d1a3c94---79298634543.pdf
    • http://detaycopymatbaa.com/userfiles/file/74365257081.pdf
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/bd4c33217fe318e3c0858ee44822dfc3/fewofepirutedipizilox.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53f08ecc14---rogojefarudixuretiwineje.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/bdaa7a6cfb317ade07b2913347a05aba/55189765146.pdf
    • https://clubelsendero.com/img_pag/file/zobamoku.pdf
    • https://springkasteelhuren.be/userfiles/file/72918606325.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/olibv5iegetldpjgt4fb8pj073/10780794597.pdf
    • https://rumusjitu.com/contents/files/58582683374.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/3c272289862bca7253ee8a839800613f/kaguzitojodevanewaxi.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bef071861d7---fitefijemewawomeloduga.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/gkfl1sa54erckmfkqlrndt07g6/31753987993.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=robert+skidelsky+john+maynard+keynes+pdf
    • 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_off0000c691.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC691 16792 bytes
font_01_sfnt_off0000dea8.bin
9270fa385f09c6d725a9254c2dcc0029db602c0854523d1b158c37afe82b8bf6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 11284 bytes
font_02_sfnt_off0000f8b6.bin
12e14bbd8b350749b6587f18e06f9f60433feebe4183e5def06361fc204d6f6e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B6 17060 bytes