Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2bad9ad4f5bded3…

MALICIOUS

PDF

75.8 KB Created: 2021-09-04 23:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 94cb47ce0b50460c0be6bb33b1c11ca4 SHA-1: 52db9bf1092e62bb624c95ecc7a7358f2003fbca SHA-256: d2bad9ad4f5bded3addf4c29dba7921e97ff226fae5efa271979927b61dcd68f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.gamylai.vn/uploads/files/betamojivi.pdf In PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/64919952997.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/vonegulufaguz.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/pajonogibusorerevobuwumon.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/gijoboduzife.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/53644323804.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/sinufoxak.pdfIn PDF document text
    • http://xenangheli.vn/public/files/fadovumatowerolewodet.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ccbc572a24f---futonowakij.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/8839144726.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f83392d56e1a6108b9f082f30efd24b0/89509214426.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/13542303430.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/fegovaramuwogenin.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/39936403888.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/69780978245.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/lotinonijasoxuroxolajuj.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/lufatodamakanaj.pdfIn PDF document text
    • http://fittbikese.hu/files/file/tobidurerinazit.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/dodajunelodanekeve.pdfIn PDF document text
    • http://www.asslar.de/downloads/vagigebalutusigi.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/galeritigasurezo.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/s7f2g9tbtqg0ibdl1st17m10ke/zamasutifamokemabivaxete.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ae51adb76e1---nofaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ibps+po+2017-18+notification+pdfPDF 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_off0000c43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43F 11012 bytes
SHA-256: 630a50389f20ba2aaa3111a961a09548c4382a52efdad609d7cbae030c33d42c
font_01_sfnt_off0000ddee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF600 16772 bytes
SHA-256: 1171c5e89eac44bf855bfc60b3159ab7031140e74a1d0c34954213950f03f9b4

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