Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8507fa7542e5706…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 03:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 31d00251c5748311eca424ecd24216aa SHA-1: 32611d6a18e4a3c4313b7dca69bafdcc38319c25 SHA-256: d8507fa7542e5706b3c5b9f818d2bea68d702007455a656936a93dc4e7ed7ac0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to multiple domains, several of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://jsdarvin.com/files/xomezabup.pdf In PDF document text
    • http://chip-chup.hu/upload/file/mided.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d3b65af15eaf382936b45af06eadefee/47950245073.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/penabisetonuzep.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/rezavimimiludafiw.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210914_D6E414D218C24C12.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613937680206b---vikukanutuzojedezolimaga.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161415d952fca6---98690104348.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/27854092715.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/64156152319.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/munijivoxokesuluri.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/41954704414.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/lubatuwekekafuraleve.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/90595774606.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/41283238298.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/43794636493.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/vubenebapajimobufazagirab.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210906081832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ppsspp+download+iphonePDF link annotation
    • 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_off0000d5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 18052 bytes
SHA-256: 8e20c65a707a1f8c9c19b36e45df91fb8f3e76b3fc75835402e816b2afa286cc
font_02_sfnt_off00011c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C42 10380 bytes
SHA-256: f04b3d8c7129461f02611268e480ec68182a47e014ec8da7b39a53949da193e3