Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76732360691d61c…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 13:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb1bb4acf6564f9474428fd3bd038e51 SHA-1: 3a9e9b33e33b5f114d3e482e5bf0a4a43c6dc178 SHA-256: c76732360691d61c9555b10026fd291daa73069a5908f6e653bc2e1111849930
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ahjygjg.com/upload_fck/file/2021-9-11/20210911143442506031.pdf In PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/gofedubopupinejevi.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/13479812902.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/70113756199.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/cde8f8db55cf4904be9d3032e51dfa1f/vopevexigixomumer.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/mexadomilexavirizovexud.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109162100059958.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/79536433171.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/2876522860.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/sisunovasemavapowojofuvad.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/89888595127.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/2315cf301e4a7879283cf1d263ae727a/xefokojizo.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/fajeturejaguruj.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/vasosemivadapixe.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/zaxiroxaruposujem.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/41315874083.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/xetivubinotoxe.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/duvagar.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/32204522221.pdfIn PDF document text
    • https://anjingliar.com/contents/files/woluresenupitulobowos.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/kijezumonudediketowiwaxa.pdfIn PDF document text
    • http://labsshop.com/d/files/kafitaparexo.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/49385026049.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7babb3659---fejufuvovosopanuruban.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=live+cricket+streaming+pakistanPDF link annotation
    • 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_off0000e159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE159 17476 bytes
SHA-256: 23a652b3e6a5ffcb1402f1690d763307e66c3b4717dc2b84b9d85983684f9991
font_01_sfnt_off00010ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBB 10668 bytes
SHA-256: d155864eb12bb6787758926823a5efd65deb93d33e932b69173a9a4979d2e4f1
font_02_sfnt_off0001273b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1