Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b531145d1a7315…

MALICIOUS

PDF

62.2 KB Created: 2021-09-17 04:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 37e83b0da628ce84e555f7491c5b4b62 SHA-1: 5851831891e88f06bc64219248632465d023bd31 SHA-256: 04b531145d1a7315153e1888697c9a618086749521ad272fb2976ded60fab766
154 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to lure victims to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6459

Heuristics 5

  • 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
  • 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://vaynhanh365.net/contents/files/robimitademozasobi.pdf In PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/fopurumopexonewirejux.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/gosexanoluzizamunix.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/7975716427.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/kisaxexudufug.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/gafezunikufiwajol.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16143ced9f1406---66333166861.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/35277426942.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/66309487269.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/f37a1d.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/23606061715.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ec2ac559---74410496781.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c788fd47bc---totonerejevumubudekipupen.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/77842564941.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/69174609387.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/85762806426.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/22925503401.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/24535130607.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-9/20210909025136237308.pdfIn PDF document text
    • http://santeh.md/img/files/ramumerik.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/32264437487.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/56854287053.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/71854820661.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/tufidipafagorux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=need+for+speed+open+world+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD66 16720 bytes
SHA-256: afde04c64710c5d062b9c0ad96ff9860ad8f9810dc8dd22dbe6c511006da3e02

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