Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3e0df64210dbea…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 22:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 33fd0f607c1786314e082c61db6fccf1 SHA-1: aeffdf2a8fd29c28b5ecf795cc90de11bd09e532 SHA-256: 2a3e0df64210dbea49df9aff1a34ab721555f873b9992294003d8cce3949de41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI indicators and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9802

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://crewmak.ru/uplcv?utm_term=the+rabbit+2 PDF link annotation
    • http://seibyou-koujien.com/files/files/zuluranik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb601387c5---67526404571.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136d0494074c---tegijigerel.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/bonaruwowulelakojozodanel.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/555de28e1f9a3299eb5dabc9fa6d787a/nubez.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/68604953753.pdfIn PDF document text
    • http://teplospectr.ru/images/files/fivurijujuxagupadogufo.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/nhi9kbug8i1ib4ujru8tvv2uet/28760860215.pdfIn PDF document text
    • http://zenithmetals.com/files/zutogerejozibapax.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/50383622662.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/ganesesufaxizosito.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/29497550668.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210912160225.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/rexuzug.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/gifiluzetodosirenosiwigod.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/detoxarafafutu.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/todetutuxebix.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/tuparofineta.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/18324466217.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/58200809247.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/xidugivoletibutipok.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/93911529385.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/tafogonomalanikum.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/11802610357.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/71359935111.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/fijusevawuk.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_off0000b454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6A 9988 bytes
SHA-256: c930668cb5eb5370454c8a0fedaccc713e34df916564c5975190dff3646beb4a
font_02_sfnt_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 16212 bytes
SHA-256: 3df98e8880a5d02d9e3bdf1295dc30a076f326ceb27c552fb9ccb5909996decf