Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4abe420f3016ad0…

MALICIOUS

PDF

74.6 KB Created: 2021-09-13 11:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2a00ea4c1edc5f1928f813a92c230a0 SHA-1: 507541f3ed1a193b63ebf4935300b591b0b4fadf SHA-256: f4abe420f3016ad0214e5535d41ce185a0ee00fa17090de3a10e14e5fab75018
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and ClamAV as malicious. It contains numerous embedded URLs pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates a tactic to obscure malicious links within a large number of disposable or compromised domains. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=dragon+quest+x+apk PDF link annotation
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/zaginox.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16138193abcd8d---24107727381.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/zekudebevupunabu.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/12398969961.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210903025451.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/35018728884.pdfIn PDF document text
    • http://hueide.com/upload/files/58456749269.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/nunufuxenifuximox.pdfIn PDF document text
    • http://schubert-hh.de/image/file/46757027833.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/vigesanelogolevuwu.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/jebubibowujupeg.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/vopidazon.pdfIn PDF document text
    • http://metall-press.ru/files/25197351957.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/nuveketi.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/69366258889.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/52432997099.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/7189368950.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/zenoxosakilofinamusu.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/71f10ae8c2bdee061c9adb5e35084c8b/70512785340.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/71614156959.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/pikuxopanawotizifexufafox.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/xijozudatajukuso.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/94120881118.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/99600160193.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136e9604b87a---xivazexabujutavini.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_off0000bf1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD731 10732 bytes
SHA-256: 0f18d1a61a4e8608ed8cb55f2dadcc8e6ce2abda4ec0869e13a30ce963062bf4
font_02_sfnt_off0000efb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 17844 bytes
SHA-256: dff7efec0a2ed69cc6eea2c9d6e1a43cffea9e2e8f021b5d8a52bbc93826352b

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