Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa82895f21fa995a…

MALICIOUS

PDF

99.2 KB Created: 2021-07-28 10:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e5d616247943b0a011ea7a60a191187c SHA-1: 9bcdc4b2f3b2559ae9455bb74b76674a55a8581a SHA-256: aa82895f21fa995a66858d8ff5622d7d5a8fde60cf0107580fd12771d27c530e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the PDF and its numerous external links suggest it is intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://animalscipublisher.com/files/upfiles/file/pevidu.pdf
    • http://ikra-ekb.ru/files/fckeditor/file/94573431854.pdf
    • https://naucharts.com/ckfinder/userfiles/files/18185907990.pdf
    • http://www.pattyn360.com/upload/forum/files/14431391057.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/r7ng7fg09ra9ibgv7uglgdm443/bavage.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c482b886c---balibijubaworubijaj.pdf
    • http://saovietgroup.com/upload/FCK/file/narovojizafag.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac1d1458a6---17362873411.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079977d646e2---muwuxariwopulo.pdf
    • http://nowator-zpu.pl/userfiles/file/48363918481.pdf
    • http://woodwork.pl/ubezpiecz/obrazy/file/18384914217.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073335a25f75---49426029367.pdf
    • https://gadd-asso.org/userfiles/file/wodujugawiguxuniji.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4b1393d5b---nawunaxobat.pdf
    • http://20thhelicoptersquadronreunion.com/clients/71358/File/42503241383.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/k20od6i38g6ikoi23hqk8u8br1/mubago.pdf
    • http://ifa-astrologie.de/userfiles/file/10727418967.pdf
    • http://architettosbaffo.com/userfiles/files/36741640810.pdf
    • http://mgtofubbq.com/uploads/files/zawiga.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b776fc1b99---68473052840.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077118588b11---razorajon.pdf
    • https://keluargamimpi2.com/contents//files/63346772464.pdf
    • https://dacinsara.ro/fckfiles/file/96317124464.pdf
    • http://constantemail.com/userfiles/file/162331399991217613921.pdf
    • http://emke.hu/uploads/ckfinder/userfiles/files/72382402399.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=game+of+thrones+piano+sheet+music+pdf+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B85 16792 bytes
font_01_sfnt_off00013397.bin
734b62c679d1496fd29cf087b9e0af669d4fc14c93009a79a37d46282f59a894
pdf-font-stream PDF embedded font (sfnt) at offset 0x13397 18024 bytes
font_02_sfnt_off00016293.bin
4ed430159e59e5309abacc9bbf62920a3540533939ac2a69be4ee07db8fe07fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x16293 10980 bytes