Malicious PDF — malware analysis report

Static analysis result for SHA-256 f946ec98808bf828…

MALICIOUS

PDF

71.4 KB Created: 2021-09-11 22:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 07bcc0cb5ebbfebfb5468cc63bad51ee SHA-1: 1d57e959b017304bceed95ee85bcc711115478a7 SHA-256: f946ec98808bf8289684a61133e6eec1ce48b83077368d7e2972ab94e39a92f7
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://totoquynhhuong.com/upload/files/bakajowatutizavesib.pdf In PDF document text
    • https://sinarlangit1.com/contents/files/31058275380.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/mabolorexen.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/25522299828.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/3361405621.pdfIn PDF document text
    • http://m2m2design.com/userfiles/kutilelolaxuvozon.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/fezotubasobojivajikaxaw.pdfIn PDF document text
    • http://szwygs.com/upload/52191212836.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/tekiti.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/3b8e8ac053cb25d6af2beeab7e8ea70c/27739761980.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/wirofujunarusibak.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613180c18e54f---lowuruvasotofani.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/4fa10d0fef022783af881592e3464647/tukonujebowedalix.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/jumevunepa.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/rupijatokid.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b89255df470b081e3b0da7069914ea53/filomikikulurirovebara.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/muvivaxoxuw.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/j5uego1ameq35lt1db5qime3d4/3356809408.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/47491883536.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/nefotizinetimazoru.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/nafalutevenoroverut.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/53787250700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=wolf+of+wall+street+full+movie+free+hdPDF 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_off0000b4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C9 10760 bytes
SHA-256: f625cf391171e7c5abe349ac651aefa515e7eec9d3466dd3bbd4204eddace912
font_01_sfnt_off0000cd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9C 16496 bytes
SHA-256: e023578d94ed9c03f4ce39f8ed69a20924c276d264a91ad5d1c0393c4445a016
font_02_sfnt_off0000f7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1