Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f08bfafb00018d…

MALICIOUS

PDF

79.1 KB Created: 2021-09-03 22:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9f0d19ef3ab0edabdb4a51cf7d4eb875 SHA-1: 59f0b3aa582e1bf87bb2a686ff1834a4c178fe7d SHA-256: 23f08bfafb00018d08c043311db13a6b1a77d0998e5a8c479542a2dc7b5fd62e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, including compromised WordPress sites. The presence of these links suggests an attempt to redirect users to phishing pages or download further malicious content, aligning with the characteristics of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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=hague+convention+on+international+child+abduction+pdf PDF link annotation
    • http://ahchala.com/img/file/35617239300.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/9575491136.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/nosujijimimexajanigifona.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/kinakotesexaniloz.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/42576186139.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/tupitisig.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160753ba8457bf---veribusiluweduv.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/96521719175.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf03710bb3---vububusagosotilud.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/kawibobifumorata.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/gojobokupituba.pdfIn PDF document text
    • http://planetamama.ru/files/file/xenajubinavajosesigekul.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9f2367712---nokivakibazimiwif.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0f8076b71---85224159264.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/bdcb32eabd39ee050f23c60988f286d2/wefewoxej.pdfIn PDF document text
    • https://negaratoto.com/contents//files/bovubor.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/muxajukikowimotopi.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/84267133464.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/tsp8m6ljd430rklea5el6rcng2/39911392922.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5826b6390b---24972367571.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/8db9fa7d203537d95f449eba8e8e04bb/debop.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/86544544069.pdfIn PDF document text
    • http://www.asslar.de/downloads/84740189478.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/96026053037.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/fetolopivesamoniruju.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/lanus.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_off0000d2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AE 16608 bytes
SHA-256: 13596ab54ca373f41367608633838db227ba44ec445bbd986d17a3f683f28383
font_01_sfnt_off0000fced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCED 11028 bytes
SHA-256: fcc0543a884d77d1b9b1f5bf59dfe9ead5b7aaa9e367f7e3e8a636622dd436a6
font_02_sfnt_off00011601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1