Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ed973f0d59f429…

MALICIOUS

PDF

78.9 KB Created: 2021-08-17 00:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0af752c4174b67fc39e01d23d43cb96a SHA-1: 55fa39b3eb10cf2057bc61a590d70aef6ff21f27 SHA-256: 61ed973f0d59f42942e1e023789cf51568e4b8aef3a463443df75564331876cb
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS platforms. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to manipulate search engine rankings or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://designpavelzapletal.cz/files/file/dagemabikadiwenenidew.pdf In PDF document text
    • http://dragonera.cn/admin/userfiles/file/13342475327.pdfIn PDF document text
    • http://prestopc.it/upload/file/pelamomiradolim.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/3fcpp3llacj9debdh30gmjs6ag/xirezalovotiguj.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789da855e2b---88591262838.pdfIn PDF document text
    • https://herfection.tw/upload/ckfinder_temp/files/20210620033426.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d4603ff8a---nutexivakisuvisitavifigiz.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/18833750628.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/45544734248.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7586c39cce---nowep.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2268c4b92---11494117032.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e8b365786---84597416938.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/a764d8452888e4854a44849e83e65b87/xatutovufitepexala.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/52441646777.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093de35eea6d---72209040734.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/95133b22a84bfcbe7c42172dec03d001/38307464659.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/basefazojovafepe.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/83443534785.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/kezutebebizezinasa.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/xaligo.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ffd66dacb78---23023173833.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e23a5cbc2c8---70792561963.pdfIn PDF document text
    • https://soechi.net/userfiles/file/60922521531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=excel+2016+pdf+freePDF link annotation
    • 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_off0000d44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44F 10416 bytes
SHA-256: 85adf9bffd07ed983fdf188e297a65ee95d16656a04e5419fbe458610f338cbd
font_01_sfnt_off0000ec17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 16280 bytes
SHA-256: 8c175177e0886243222b9344a8ad14a5f12ee8297662df0575a2737ebb506163
font_02_sfnt_off000115fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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