Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5568f1ac65aade5…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 10:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 19026fd634040c8d4ac42907142f2084 SHA-1: 040b18fe9157916a519afba107022e817095e6ae SHA-256: b5568f1ac65aade52fc0ac0c20e93c9f45b683b36e39fde8388745683879540e
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 URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The PDF structure itself does not contain executable scripts, but the embedded URLs are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ketchas.ru/uplcv?utm_term=game+torrenting+sites PDF link annotation
    • http://tuderprogettazione.it/userfiles/files/70261519389.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c176369ef1---lenonamorobixupeguruju.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f06f0d61a3---lemapunupetuxilokim.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/tedanofedipalek.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2fbe81ed441c93719bf37648981208ec/sewegoloxi.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/51673052539.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/1132bfc7980486c65f1eb2b046e080b7/tiwonofevovexarerunanita.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/64716544038.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/damisonapimop.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/wufaxarekamivotubananimu.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/dewelifisu.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/dowexininoda.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/7c0cf65e80abb038c403f759f6888714/91831291254.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/wavez.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/24807000732.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/86133097938.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109141356106969.pdfIn PDF document text
    • http://adice-area.com/pictures/files/77177017581.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c59b12903c---tivegi.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/nolinefofazudul.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/tajenopunosexelulotufep.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/nopebebazavufo.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_off0000b2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB12 10444 bytes
SHA-256: 2b19c94b257d21a815b0603aa7e9ff05bef5586fe323e642246dce7b53014ee3
font_02_sfnt_off0000e2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C2 16816 bytes
SHA-256: aa32343f124566dbf49bd45b6590356ec294577d8c5017ddab5bdb8bc3180247

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