Malicious PDF — malware analysis report

Static analysis result for SHA-256 40294fc8b7c67735…

MALICIOUS

PDF

75.7 KB Created: 2021-09-02 09:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3f5a67155ae692a0c2f41557f77944d9 SHA-1: 817c56eb47a30ae829efd3ad5598f7ccd35e8f0d SHA-256: 40294fc8b7c67735c930921f424267d3a886f618a2157f98ffc84326da41541a
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection profile strongly suggest this PDF is used as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://garglob.ru/uplcv?utm_term=3.5+liters+to+milliliters PDF link annotation
    • http://starsunited.at/upload/files/68170998631.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/fu0v2cplektsn27m7hf490tgu6/mawigi.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c662b985f60---67098246954.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/paroxewol.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/joxepidopozuwefuwakisomef.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/jexedopodivil.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/berewadabofejas.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/xawenugenetav.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607adfbf6f65c---38843570383.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/34f05991537ef2fd7f94a95953aec2c5/gapevolimebuzejid.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/3161668839.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/45575491547.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/baa70ec22839a2acce9fffb588065bb4/2790740100.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/29ee62acf733f84adbbc805511a4928e/biwanavilenetalamesapikep.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/foxetiwobibimadejexozisaw.pdfIn PDF document text
    • http://chamdure.com/DATA/files/60454662086.pdfIn PDF document text
    • https://unosms.us/userfiles/file/15954545283.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609893cc37853---99742162360.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/94a43c6cf802113181b46f41ccd86833/435734588.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086badfd28fc---jotowetupudukadavuvej.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/v0mlj0g969jd3ti43sh1ijp378/89315310711.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/lamunarobaxunedazomozinud.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_off0000c614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC614 10276 bytes
SHA-256: 113b76debf9d4a70fff258ca5226d9472be0baff77b8eb6cd6a719efeafcffc5
font_01_sfnt_off0000dd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 17060 bytes
SHA-256: fc1d1ee816a83c70113b7f3c43f1b5944a7a35442943a68437a71e3fd93bf1c5

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