Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeda828b2780f487…

MALICIOUS

PDF

77.6 KB Created: 2021-09-08 13:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9823bbb7540881a2f91e30809c7c4ad6 SHA-1: 6b85a4cf9f984e971f21063555ddb41799a953c7 SHA-256: eeda828b2780f4876ef31ecebb02bbf46cfcbb51b47c7389fbfe510cd9315ac8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristic analysis indicates it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The PDF structure and embedded links suggest an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=old+testament+bible+history+pdf
    • https://abyway.lv/images/ck_images/files/98629546169.pdf
    • http://colantuono.it/userfiles/files/jawetupo.pdf
    • http://gartenmessebau.de/uploads/files/megifewomukibejujelar.pdf
    • http://madonnina.info/userfiles/files/7508094612.pdf
    • https://cape-electronics.com/media/file/nozivekaw.pdf
    • https://bak.vn/upload/files/weligazurufisumovepedodaw.pdf
    • http://kme-kme.cz/files/file/5006418071.pdf
    • https://suadienlanhhanoi.net/upload/files/ramulogogivoxiresupuwuw.pdf
    • https://propertiproperty.com/Uploads/userfiles/files/vevusapixudodojepo.pdf
    • http://pensionpoint.cz/userfiles/files/kapalesezubizemulujoz.pdf
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/64929699678.pdf
    • https://livewireeventz.com/userfiles/file/wenibewibotog.pdf
    • https://zabulgaria.org/userfiles/file/4333935686.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16131215781957---rorejalixotamifoxotiru.pdf
    • http://stainless-faucet.com/uploads/htmlupload/files/tasotilazenurodez.pdf
    • http://ahcxdq.com/uploads/file/071858498672.pdf
    • http://cn-junsheng.com/upload/file///202193112322122.pdf
    • http://altus.pl/userfiles/file/50478830910.pdf
    • https://ibeguiristain.com/userfiles/files/38573877408.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161301a6d5a710---42757378124.pdf
    • http://dsagco.com/Upload/file/72353483008.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bcbef3498---geditorozujarapabe.pdf
    • http://circuitvietnamcambodge.com/hinhanh/file/bazesetorapomiko.pdf
    • 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_off0000cb99.bin
e032d72ed019c08c7a44bc8a034d03f79d0267500659d4b1ff33c2adc0676d5d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB99 16952 bytes
font_01_sfnt_off0000f757.bin
e18f65e5c2009b7206da498210d7d41a24f5798c61550c6dede6f2b63694bde5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF757 11040 bytes
font_02_sfnt_off00011098.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11098 16792 bytes