Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc43584a56eefac5…

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 02:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6b05c3de86bd78863fcc8968f78b4357 SHA-1: 18229b9cbc90cc4b81c341b1a06a25451f6f1e9e SHA-256: fc43584a56eefac5e1937db3a26301e1fe10d01657a7ad65883eb6845cfbca38
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=oleo-mac+g53-tk+manual PDF link annotation
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/65407753672.pdfIn PDF document text
    • http://dges.in/userfiles/file/dejenufigol.pdfIn PDF document text
    • http://bangtutrang.com/upload/files/7942709370.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/wamulimofilevipemuxetor.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/gabuwimemerokoziriforixi.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/lejarem.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210611_210010.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/42314552254.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/fusogu.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/pujotovikerebinamejuzutu.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/jiruwupuzenimivabit.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/59dcae40a272754f81669ee55a15799a/nojim.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/vegijikuvokagojadot.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/47241301480.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a87b5e75d8---sodenevadavimarivow.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/2016905420.pdfIn PDF document text
    • http://www.celso.org/download/toluzetizasasad.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb26de3a93---vososamuvu.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078b60f75a08---58365386487.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/pirabimutipexefusepo.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/950464636.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/bogapegoteno.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607554b56bcba---xakefin.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/fe9625556c698b0cde4338ad882b8940/kujiduto.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_off0000d782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD782 10768 bytes
SHA-256: 1fd4eb1144a15aae008b84c16fb4a842af31ca3f7ef3f4527f32c462a0109822
font_01_sfnt_off0000f070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 18348 bytes
SHA-256: e97593f7fc7739500b417810e7cf712dafb6547301a8e591f2590b1fd346eca8

Open this report in the interactive analyzer, or submit your own file for analysis.