Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb19798e21543f78…

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 05:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8c6b3957d8c1213d612b426818dd5407 SHA-1: 51e9519d0731dada9440c8e8d13a5bba384148e2 SHA-256: bb19798e21543f78d2a28846fd6b6728ef4093a601d8b62f217b1f6bf47d2261
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 CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure suggests it's designed to lure users into clicking 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://sartor.ru/upload/files/getotemubuxokosokiwo.pdf In PDF document text
    • http://maivietnamesecotati.com/uploads/files/sakurizo.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/76c25adb8ca6b2129880f8849084de62/reranef.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/78906617593.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/3273200616.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/22716446662.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/pagisubinu.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/31718123876.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/rulinosuwokisunawefatozaj.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/88333424047.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/narenep.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/lunalajixesanutakibizev.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090120582329.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/70510657010.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/pepatezemubipatikufebepes.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/redirelufu.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/93108057806.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/76534665157.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/56928755241.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/doparuzexikaxunepa.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/pibewodem.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d232bde31a---juvulovixaz.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/17372145172.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613df8e26bbb7---sojateteteduzifisuwaxiluz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=mortal+kombat+mod+apk+downloadPDF 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_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51A 18416 bytes
SHA-256: 7d7c53320c78de4646dca4991775f08e73e03440445ef9fe534863d0a04dedd0
font_02_sfnt_off000124c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C1 10472 bytes
SHA-256: 124e42e73dd4c3b154b3d472d971122a61a83fe8ed019c8dd79ee849245557bb

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