Malicious PDF — malware analysis report

Static analysis result for SHA-256 a755fd654a568662…

MALICIOUS

PDF

74.8 KB Created: 2021-09-12 12:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 404d0082f9d81b4fddecca3a5770710a SHA-1: b51a469a4c86551342d7248a49be9967db9a925c SHA-256: a755fd654a568662d8a4178c87f3beb57ac507d620a9fbf5f8f420109095f29d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://abicecream.ru/ckfinder/userfiles/files/73844969021.pdf In PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/kisasetiwabopodojuzis.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/40195214128.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/37357362898.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c07fd512c---lodulisijotev.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/lizozemugajogogebiwolilit.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/70781692120.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/nogegisogop.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/58722597454.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/17912192157.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93202436272.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/15928955623.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/87635175758.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109110502095363.pdfIn PDF document text
    • http://classtool.info/upload/files/45053847100.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/85569279270.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3659e0372---ratipazalulozukipi.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/69930109373.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/pukebunipuxam.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/wuziratupofamuposadevada.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/57598848420.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/onjir0jtvu2ob85mft4ru1v4ko/jireboputefikupu.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/eb96953dca29cc33a45c18265d1101eb/54162940261.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210911110245_bfl6vc.pdfIn PDF document text
    • https://paperland.bg/uploads/file/finilubafenepogaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=matlabi+dost+shayariPDF 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_off0000be23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63A 10356 bytes
SHA-256: accb21b400bc5f47e2631fcb5881832e8e59b86837734b562e1e05a8eee0267c
font_02_sfnt_off0000edc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC0 18784 bytes
SHA-256: b3f9b56ca68e90ed94fbd2f199cdfb713642d2bfb98765113c03b76ff7e51f3a

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