Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c4b7e0b4cf67d2…

MALICIOUS

PDF

68.9 KB Created: 2021-09-08 18:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 72f70b15e8c55e749558f20fcfdb46bc SHA-1: 723576c6d79288534b1dd024424044cecaa647b8 SHA-256: e1c4b7e0b4cf67d2bb6724e39f13f950497202cc73174706326969caee4a1480
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and a ClamAV detection, indicating it's likely a phishing lure. The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://philabc.ru/uplcv?utm_term=cell+viability+and+cytotoxicity+pdf PDF link annotation
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210903_075920.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/ginegixaliwanovara.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/42316137820.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/49604183111.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/90513945774.pdfIn PDF document text
    • http://indexone.ru/upload/file/88094640358.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161331cf1b20b9---83797566666.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b367ae64ad008765801a801eab913897/83225195900.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/dexowovebemu.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/41727987694.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/88141643048.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/97359464259.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/funetopazobazefomeriwer.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/femagikajud.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/tuxivij.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/rawilixusuzifirabizo.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/wimobojor.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/36421371760.pdfIn PDF document text
    • http://kme-kme.cz/files/file/67880739113.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/77321143022.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/95108984081.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132819717246---6647267267.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wawaralusetaboxiroxu.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/xelasolig.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/pewikudaxo.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/menagulawatazi.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_off0000b24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA61 14044 bytes
SHA-256: 0757a5f7bcec64e207fb0eeff8cbe9a39a30cc7bef907477ed8c28cb9f5b527d
font_02_sfnt_off0000ecf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 10800 bytes
SHA-256: 3567f7b8ef8be1e4770730d8d4d3ffcb15f0a51692b61815513dcaa0addfaaa9

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