Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4fe4d3f69de5cd…

MALICIOUS

PDF

67.3 KB Created: 2021-09-26 20:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 414ac0944b4b039e19170f2cffc4e798 SHA-1: c733fbfac2c681133c4eabe511b3a0ec6f68c5b2 SHA-256: ad4fe4d3f69de5cd675385eb4c1452f6c0320194ed22612c0e7cbe92f155f7c0
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 the presence of numerous external links. These links predominantly point to compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 0 text block(s), carries a click-outward action, and is only 67 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://crewmak.ru/uplcv?utm_term=list+of+apps+in+play+store PDF link annotation
    • http://ippon.lv/uploads/File/liwesosu.pdfIn PDF document text
    • https://projetovm.com/uploads/files/dosipiboru.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/6173864476.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/77643937177.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/a988ad9eb2280aaf8804fc489543d7d7/rikosipamevemetagaveri.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/fugunelaruwogi.pdfIn PDF document text
    • http://viorina-deko.com/images/file/97451243744.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/dodigowiteb.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/mebuzujuleronutuk.pdfIn PDF document text
    • https://etadelloro.it/images/file/doxomipabojopekuk.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/5c1c4c06c48ae32f00de4a2cecbfa770/fozujufepukimugosujaruka.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/kituvuwimujijes.pdfIn PDF document text
    • http://ktcz.eu/files/files/10275461019.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/19302061859.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/jogewuwaz.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/20767271171.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161430d2ea5f5f---wezokepemupelapazalevibo.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/fonesobelajakikabobi.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/diwizonopudedafedeled.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/466869663.pdfIn PDF document text
    • https://nakshistudio.com/ckfinder/userfiles/files/vowasenaroluje.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/mozegovofulojavu.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/dixajakejebotijuk.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_off0000ada1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA1 13968 bytes
SHA-256: a33b430969df7e281d6494cb33c93a6c134df79c09e4b6e83465cf822d18e861
font_01_sfnt_off0000cffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFC 10420 bytes
SHA-256: b872bfb636346c6bf4e91830337fc1bb8b515cd7544b46031d316d2dd567e38a
font_02_sfnt_off0000e7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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