Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0f489b42774370…

MALICIOUS

PDF

68.8 KB Created: 2021-09-22 18:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f11dac173dc539cc1b42c28226951fcd SHA-1: 6982cbc95fa25c5e566438039c3df02a440b5557 SHA-256: ae0f489b42774370289bb46f54a2a5e90ee6f74984974b75d5d78167d73211bd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm designed to redirect users to malicious sites. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing or trojan variant. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://havadisname.com/upload/ckfinder/files/97771699723.pdf
    • http://studiocariola.com/userfiles/files/saxedofurelegefikolo.pdf
    • http://tfh-filter.hu/_user/file/43374133869.pdf
    • http://roletyhanarol.pl/files/file/36664996377.pdf
    • https://seerupit.dk/assens/file/12566833970.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614451f0e53d8---vezatosuvopavogikukoke.pdf
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/36485105539.pdf
    • http://xutricolor.com/uploadfile/files/siwadidezitonixezarulimo.pdf
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/xerimavagiwobirafasor.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6d9388dfc---vimave.pdf
    • https://hunde-katzen.at/soubory/norusiwageganodilojutis.pdf
    • http://trivio.it/userfiles/files/84947682040.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161429b7e0d509---70815556714.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332fcfce461---58147199930.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16144a3f82b2a2---30566218373.pdf
    • http://matkinhantai.com/luutru/files/lizumaxipusol.pdf
    • https://indiantalentjunction.com/milan/media/65783606388.pdf
    • https://jamisonfurnace.ca/userfiles/files/30076982831.pdf
    • http://good163.cn/Uploadfiles/files/vinosusoporovagikin.pdf
    • http://apicn.net/upload/files/gutugenugel.pdf
    • http://nurugelexport.com/ckfinder/userfiles/files/16797628655.pdf
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/29626574463.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=watch+monk+online+full+episodes+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE10 16792 bytes
font_01_sfnt_off0000c627.bin
4c8b532ef4c4c3105bfdd07a756fe944a4b43656a13e1d058e8cbd26539928c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC627 11072 bytes
font_02_sfnt_off0000dfbb.bin
4a4463e0fa19b5d0bc1e0fd368b2377f9fb236b5c5e09928e7e89e342c64c7be
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 15164 bytes