Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5361d5c0b92771b…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 10:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 59aadbb0374578cae46424a91b9fbfca SHA-1: d3d9cf900101f8d671ff6515f7b55f2fcb52c628 SHA-256: e5361d5c0b92771b2599888f983734b882dc0e2dc78cc749d24647a64f3c5c21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the document's primary function is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://queure.ru/uplcv?utm_term=best+way+to+transfer+contacts+from+android+to+iphone PDF link annotation
    • http://seoaudytor.pl/userfiles/file/votesizujoxuwadefojaro.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d8f1164c2---35202956892.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/82272880961.pdfIn PDF document text
    • http://vitcongiong.com/uploads/files/39410905886.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/97466458666.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/98744550178.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388cf45a548---97049397697.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/30344448626.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/78816282361.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/tapaxebonegofutim.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/35615854278.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/3399413567.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614336e91c0e0---17114763388.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/xokotiwepipapurifo.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/xelotizupajawef.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/39570696067.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/68553918945.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/vj09agj929tq3ahrr1g3dcos4p/46631908506.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/68414911278.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/36945042275.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/8edde89a9d8ac0eb22b728c613560bfa.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/80625099295.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/33112777316.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/gekubotajet.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/tajijakotodewetijagupike.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/zipizodobuxidul.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_off0000ded1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED1 18172 bytes
SHA-256: ba7995bd3d136d714a5dbc3155842b3c2bfe3e3c5893cb13acb22f02bae35123
font_01_sfnt_off00010d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D83 11092 bytes
SHA-256: fc8555e38a2ad14d9ed5c0ab86f04f3555086f212f2ce5edc8af6493f256c62c
font_02_sfnt_off00012751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1