Malicious PDF — malware analysis report

Static analysis result for SHA-256 44372af973631bcc…

MALICIOUS

PDF

81.4 KB Created: 2021-08-27 20:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0f72de9fc8922984abfd089440cce0a2 SHA-1: da73260311de1f042a6cacecef80ceea723f4e7d SHA-256: 44372af973631bccad528817346df2755e5a7afaa361579a5ea56a355b909b0d
196 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely instructs users to install or connect to remote support tools, a common tactic for gaining unauthorized access or delivering malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://smidgel.ru/uplcv?utm_term=android+mobile+unlock+software+free+download PDF link annotation
    • https://ajwatravel.com/wheelmarine/userfiles/file/62241042453.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/m3fj4hd0c4humop2mo33bsdam2/riwamexom.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/87664411967.pdfIn PDF document text
    • http://garderoba.sk/images/_file/70843016497.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b4f0cf2ee6929c09f9f7019c279902eb/zexusofemifojidemipuj.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd19656a24---mategamadoje.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee47c4a0f---jofaligonukurulugoso.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2362c82ec---xidavawezugegimoromi.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982746b64ec---25242946213.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5defa7b207---bubimepiwaradagedidebudi.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608146107002d---95486593286.pdfIn PDF document text
    • http://whatdwellswithin.com/file/75692779513.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/48047329329.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/qsi8klaqg5rntbjhf1k9i5tmtg/rimafavuv.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/21569874398.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/c2arijnar1m34lupda5h3u038r/41674028589.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/221e4a0a07bd799f94846cc39d74df13/dazodezajikumaxufax.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/lipanabapazupanofur.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/21795381147.pdfIn PDF document text
    • http://cosmoscm.com/contents//files/moxiga.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/gowapisawoverubukokavag.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/4f54b28c1793d4ce83cb5f9b2147d0ba/32592811980.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/widopunorugikinoki.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/lovorexedipitebowogomujo.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_off0000d932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD932 17192 bytes
SHA-256: 190e2bdfd5e0a6445d0f48212f42269d60ca510974c9c046f011dbcd110cd482
font_01_sfnt_off00010548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10548 11036 bytes
SHA-256: 2fb8199df2e8f83aaad526ad39b180a2cb3e95742d4b688209165d48fd581141
font_02_sfnt_off00011f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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