Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2e9c79a8923437…

MALICIOUS

PDF

85.1 KB Created: 2021-09-24 03:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3f6d8ae8ea96551ab6ba557a2fcf0572 SHA-1: dd7abf2ae45c83111ec3b1d30ea78cf1a5c34f17 SHA-256: af2e9c79a8923437c8fc82c7bdab1ce75bc761e1fc4233a58a233e3dfbefe1b6
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, directing users to multiple potentially compromised websites. The presence of numerous URLs, many hosted on disposable domains or compromised CMS uploads, strongly suggests an attempt to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://fairfresh.net/assets/admin/ckeditorimage/files/tiviwusarofujitiluduvuv.pdf In PDF document text
    • http://ooexperience.be/assets/Image/files/biguladumusefunepub.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138279366611---gozimuwexagaloxemojar.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/7919294808.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/sabupukof.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614be78e916c1---9728463396.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/41182366617.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109011536086516.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/as51blgdqp1fj4tltc89ovm9r5/gisidezizopupijifezodufef.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/43460808811.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414192ba73e---zobidobobos.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/fatetabowavokoxikepi.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/tiwunifizol.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/zarupenuvanafeka.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/duvuvewisokowasura.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/keluxifagoziziju.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/rikuliloze.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/74449550617.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/5513607157.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/41539315550.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/dijovobekolikato.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/84936561810.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/79910895839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=dream+league+2020+game+offline+downloadPDF 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_off0000e6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C1 10860 bytes
SHA-256: f67b928e4f687439966cda77e7fa60511cc61eea08185b67a4f7f7e7821955ef
font_01_sfnt_off0000ffa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA7 18124 bytes
SHA-256: 429dea8f4273461a412960786c073b3ffc124c9763b10a9a5e74820534f12825
font_02_sfnt_off00012e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1