Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56da5f761ec6401…

MALICIOUS

PDF

69.2 KB Created: 2021-09-24 13:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 816ca37272bec72764fc04539f173648 SHA-1: 0d5db304fa0fb767300c513ff4b699ffbb6e4594 SHA-256: c56da5f761ec64018cc8a7cf783e65e8b4030fac27ee6d04e2ee689b37441e5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://oniceh.ru/uplcv?utm_term=free+fortnite+cup+skin PDF link annotation
    • https://baobiachau.com/luutru/files/zejap.pdfIn PDF document text
    • https://mkart.it/uploads/file/50824967187.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/96247999434.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/18765606276.pdfIn PDF document text
    • http://santeh.md/img/files/48212052480.pdfIn PDF document text
    • http://edituj.cz/res/file/44334279623.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a81b5e1463---94986815120.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/pavutawupasusoba.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613702d29673a---2519779048.pdfIn PDF document text
    • http://strahyi.ru/images/file/73049961083.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/fasikagakukewajufu.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/20067570122.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140638d5e268---50430467186.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/velifiwukefironefemujon.pdfIn PDF document text
    • http://rem-proekt.com/f/file/18330137088.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/jokilejixuna.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/dafivoxasapa.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/xufagikefelibuja.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/77439688870.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/99023278689.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/xofubakalefepifuvamawis.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/21575014813.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_off0000b063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB063 10432 bytes
SHA-256: ddd887beeb8b7cc34057b0b64bc148a360d01e9c2c35225abcc35d501e1a083f
font_01_sfnt_off0000c82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82D 15352 bytes
SHA-256: 8d33a121b2098ab0333293b59b8f14637e358838fef9aad6917f1a569b8b125a
font_02_sfnt_off0000ef14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1