Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7bcba4e55e054b…

MALICIOUS

PDF

72.0 KB Created: 2021-09-08 07:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4694862e9ffb9721320e8d43e76fc88 SHA-1: a7bd98e218678a8b54bccdf973e848b9168c561c SHA-256: 8f7bcba4e55e054b2a972d268974e99037e5d942834479fb524e3888c0d1548c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to 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 phishing or scamming. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to deliver further malicious payloads or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a5db852881580d84103c92300c870665/razepujuwefug.pdf In PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/2c3011174891e6d0b16af259a565ec49/99673254555.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607589f131613---33344585349.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/50079682584.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612499fc3d39d---vugizipigatu.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/ronujarukorakovofosobuge.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/4448d711b7cf4fc4cea46e6ce73d4490/fosaze.pdfIn PDF document text
    • http://lse.hu/userfiles/file/19612419069.pdfIn PDF document text
    • http://fygl.net/uploads/file/161023083800.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/65118998822.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/rizolalaguretidoxibuto.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/pubadesenojukamejipege.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857bc204c8e---fewivatolinopuzowoguberiv.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/872b3b8aecfd64704426da8860d98b64/balajexopaded.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/53200779481.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e379e0e93---tokajaxefuladisoxusata.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/jikeruboxufoluvig.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a551e75cc60---xivawuzijigidefu.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/fifoxanozetajix.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81f6e4700c---13740018707.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/84395fbd5aa0eeef8a2bbf3530c2f188/95598247211.pdfIn PDF document text
    • http://strap.sk/uploads/files/65816462646.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-6/20210606141057690953.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1f005ebec38b6f45da821ee657abfe04/24123692476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=worksheet+works+diamond+math+problems+answersPDF 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_off0000ba84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD296 15372 bytes
SHA-256: fbd592f159c71c808f0ae7b406414ec86436f96a637bb8814ecfb7980a642b36
font_02_sfnt_off0000f91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 10968 bytes
SHA-256: f2a23adc24a1dd78598c6038cdf67c2b9146ab97b48c010dbb4dd8cb7cc8a2e2

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