Malicious PDF — malware analysis report

Static analysis result for SHA-256 7702ca9a5d2bf89b…

MALICIOUS

PDF

83.0 KB Created: 2021-06-30 03:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7c5555f14545155c562fca15c7a795aa SHA-1: 59ae79f1b13badae07ff8d14d0e496de548330ce SHA-256: 7702ca9a5d2bf89b661e957b1b1fa19d73428506e9d2a07c5e010b625bc98691
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. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it's not meant for direct user interaction but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://abnicum.com/files/file/zogabulag.pdf In PDF document text
    • http://autohondl.cz/userfiles/file/55005730693.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0135be1aa---zaxewo.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/jolobivalimo.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/pibpkjtrp0a04evl28jlie4hl5/14934939457.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/minerasaruladevawa.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/34063722678.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/53747555493.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/66059313220.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/60288822428.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763bd0bca70---joras.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/libezimesuboda.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/zinesoludopetipo.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/1619871577465.pdfIn PDF document text
    • http://yepuco.com/uploads/files/bapazubifuvilomugit.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/fesosarefirubijuzot.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a967f4657bc---lagigone.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de58cdab3a---43124688492.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857ea80fb82---lodeguwevibume.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/29794947008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=commercial+building+autocad+drawingsPDF 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_off0000dffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 17560 bytes
SHA-256: 25920783334567399a52f8cf8e9ea9e46651c106a20eff62f032d29bcb9a86e3
font_02_sfnt_off000125ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EA 11068 bytes
SHA-256: 1d3102236da17847c7a3020e08086248a625601653d53fb0bce86cecf8d2663a