Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d596eec01c43c55…

MALICIOUS

PDF

85.9 KB Created: 2021-09-05 08:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 41b8f4d68dd3783888b682d8187d25b1 SHA-1: 331b1eab65a3306b7891e310b88b1006045e12d1 SHA-256: 9d596eec01c43c554afa4a9e55a55cfb63ed95a726ebc798d4abd67923ccbf8d
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cssh.es/img/file/17171510590.pdf In PDF document text
    • http://malifer.hu/upload/file/vasenamelesufab.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/78083982970.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/35tci23m1lk5f1q111gemdjfu2/tudowedubik.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608270fa67846---zenurorikuvidirewa.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/0dbmp7vgt9me8g0ghcfu855a0f/piwenaxuk.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/nikabemumofiniv.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/81853383137.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/metedejekutovapanetaka.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/xamarodo.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/pasewameduw.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/95793502086.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608210a412d6f---613809608.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be93bd9f5d3---siwifaku.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/9df28b1caab305f16f6abf2964c035ef/83289321891.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/tifafekakilebusedeje.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/1d3a73d582c1787572f87dd1610593e8/98454878494.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/a28920725b867f748e8ec44bf31d61c6/jewevojima.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/vovebopiselujotepuwivixa.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16091acf56f257---23048118284.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1aec2c9fa2---76923190564.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/12546737825.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/fumazamitu.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/63078678923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=manual+transmission+car+and+automaticPDF 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_off0000edb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB9 17248 bytes
SHA-256: f86d11ef49b9639da9f95ecfcc9fd3dc24445feff3bfc1313a49a8bedfb03853
font_01_sfnt_off000119cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E2 10492 bytes
SHA-256: 0490fcab8a5d88e1e1237b042d35b1b853fd8a6f09024b6be229218d97155a8f

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