Malicious PDF — malware analysis report

Static analysis result for SHA-256 fee4277a21c59782…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 22:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a5226e2527aa43ac51af1dd71a03ab92 SHA-1: cf9aedaff8f13a407acd850777cc0c938ec1cbd9 SHA-256: fee4277a21c59782a4c10f712439aa78d9236015bd90b20cd2b190d38d1a32e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs forming a link farm, with several pointing to compromised WordPress sites or disposable hosting. The primary attack pattern appears to be luring users through these links, potentially to phishing pages or to download further malicious content.

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 https://allytemp.ru/uplcv?utm_term=how+to+move+pictures+to+sd+card+on+phone PDF link annotation
    • http://talesma.com/E/file/kodenenaviwikipuva.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/u65e349rjtuaglgfcoang36oau/joresivibetazezana.pdfIn PDF document text
    • http://parentini.it/userfiles/files/katozubokodawutuj.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ee61c9d3a63d97d926a9a80aa445d5f7/19644228415.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/7896376865.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/43028100909.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/79331293877.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/7eb149e186fe38a0f0be375a2a5f0e3b/dofilukud.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/67969913227.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/rafix.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109160523019082.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/32241878041.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/42344669317.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130354fbcf1d---18925458925.pdfIn PDF document text
    • https://e-midas.ro/files/file/49555345620.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/lixivakinavakufipo.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///55595577127.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fc950325b24841cdf800504784123938/mugejewaferoles.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/zaroliz.pdfIn PDF document text
    • http://www.siposferenc.hu/html/pinidixabonixapitotud.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/zijogomopefidebuvet.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/medep.pdfIn PDF document text
    • http://dges.in/userfiles/file/697340771.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_off0000dc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC00 17096 bytes
SHA-256: 1f4ad32c1f7dac0e42d7e61002a9407ea255d138a1d81645bd7fd03d4da72be6
font_01_sfnt_off00010800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12017 10976 bytes
SHA-256: 9f33ed78e821e4fe41945f6ceba01df54e9bc710c299cda2ad5a110f1a820b39