Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fdfaeffdc0ff76…

MALICIOUS

PDF

84.0 KB Created: 2021-09-10 01:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 60ef3cbb8d7fd4e145e2625c8faf8344 SHA-1: cbb4b907d3be3964c66d56f84ac2c407eb2d13dd SHA-256: a4fdfaeffdc0ff762e3a66eda52701f709d7b91b322cc861d097f367e9d2e65e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://irlanc.ru/uplcv?utm_term=instagram+locked+account+viewer PDF link annotation
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a80c69c7ff---nodotipazi.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/66442255143.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/69144311800.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/19093697001.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/15732688029.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/sigewoke.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/waxedipubaru.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/50561940400.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/81322105894.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/3468054183.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/xipiwuwiwitimawixa.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/d5jtmnvsrknid1fbq352bjf7pg/54201852597.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210901_070014.pdfPDF link annotation
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136b9c1b8218---54258826222.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/xeretawagakefewelibo.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/belavasobukesafusa.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/icvcptsmb6s0hh9m82l3nr68cf/fubojatuxixekogodawa.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090114063070554.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/9673250440.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/dilimesulumujipefuvote.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/kizisemumutalutajitudekil.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/supazimamatorutofavegax.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/52934570471.pdfIn PDF document text
    • http://salespate.com/userfiles/file/xonemefebobumolusesuruda.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/doloku.pdfIn PDF document text
    • 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_off0000e17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17D 18224 bytes
SHA-256: 980328946873d1290e30212fe51e82e255a317a1e6f024c606f41d2323219cf8
font_01_sfnt_off0001109b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109B 11008 bytes
SHA-256: 7c12ef027f0a9afbbc9906866766816a40e6ef1d2f8da2e42b468f54fa084ff5
font_02_sfnt_off00012a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1