Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc269aa917ea6c87…

MALICIOUS

PDF

67.9 KB Created: 2021-09-27 18:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6a646692200f75f4506e4ca22e4fee10 SHA-1: 2d2a7234fa91f480a2f860622a706c4bf2209692 SHA-256: bc269aa917ea6c87cebb519ca4f5267e1f917300b3f176753300ff3f5132ee22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of external URIs and link farm characteristics suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=le+petit+prince+pdf+download PDF link annotation
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/xilenojalo.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/68929667911.pdfIn PDF document text
    • http://studiodara.eu/userfiles/files/zozawuzivetogunufuli.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/39160056482.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/gagitu.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/tefusasasatuwi.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/kubekotupijuzipuki.pdfIn PDF document text
    • http://videocycling.info/files/file/naramozelawofebo.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/75341055880.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/8ac0d06f9838a65fab44ab931221b63a/kememeziwusivimor.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/siveladevuzobo.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/75728086064.pdfIn PDF document text
    • https://europartner2.pl/uploads/bejelivetufawefufebi.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/bovozezufujoresivu.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/20365078308.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/501f46641f0802bc5440b625085bebc9/48831899429.pdfIn PDF document text
    • http://bibonatura.com/ckfinder/userfiles/files/zugolo.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/nexemetefagedim.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/12807698349.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9a1333eac729e56be8dabfaa6d57a3be/27654324831.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/25595020130.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_off0000abdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3ED 15356 bytes
SHA-256: 5124ad24a1116f0e9fca398d6e733f166db99a0ca4c110a6f7c157bde42d2ef0
font_02_sfnt_off0000eaab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAB 10488 bytes
SHA-256: 96e45aa94c6a1f1215d7a18c9dc88b5c8212779720d7031e1f1b581a9018a374