Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d4da68677a4a01…

MALICIOUS

PDF

68.9 KB Created: 2021-09-19 13:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 66018018b563e00c107439cc9c84b7cf SHA-1: e792390e6ccb7d23a6931e1f6b8e209d0a7ae78d SHA-256: a0d4da68677a4a017288dde0f3ca23d89a724242e39b73d0a67acc1cc1fc5b68
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. Multiple heuristics indicate it's a link farm hosted on compromised CMS uploads and disposable domains, aiming to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 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=game+hacker+5.1+apk PDF link annotation
    • http://finemetal-cn.com/upload/files/27632669470.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/30238550740.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/samukonoritubowewaxes.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613112eeaf186---roruz.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/56a0844b9abfb8710b2458ac1d9991b9/89230059157.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469345607c2---44097095564.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/63175494278.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/zukefakanoxumabasojubojep.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/lexafadoweto.pdfIn PDF document text
    • http://nessium.net/userfiles/file/dezoxuvile.pdfIn PDF document text
    • http://dd-eng.com/files/files/tidagureluxoriv.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • https://sim2007.com/files/32101264577.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/26120670630.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/dokelopejotulemokopodexo.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/983i5j1ua38n3eflg345m6a7s6/63609502262.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/xurem.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/xozep.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/pikovakaraxixirigixofiki.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/d2a200b41d260940d94f9c3ac1bfd457/suliwipurafegezor.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c4ed9f294dadedee68f46d9a6fe55fc1/guxuzez.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/39763314751.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/ruteb.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/xewibidajajizevujuzowivi.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/pozifereditesara.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/46238500364.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/13994399583.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_off0000b349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB349 14060 bytes
SHA-256: dbe35abacd6c8ea2f5b7bbc9f2ac3aff7ecd6fff76585b8a2247e49d341a7280
font_01_sfnt_off0000d657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD657 10396 bytes
SHA-256: da19d6e73c88653554a64ae071a6ed03ae7618c9ed09f5cda2ed85df7dbcd7a7
font_02_sfnt_off0000edf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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