Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c386bcaffc3a38e…

MALICIOUS

PDF

105.6 KB Created: 2021-08-30 16:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0fceb5fb023f534c38e5cabcd97b63b4 SHA-1: ce94452141cf992027e6277688266f38555d70b3 SHA-256: 8c386bcaffc3a38ed6ac3921980a4f3507d1a1a37d61f25cedfc626694ce45f2
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

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://sostrevalli.it/userfiles/files/89836910311.pdf In PDF document text
    • http://traiteur-ribot.fr/userfiles/file/lonujunovafetug.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb1277b4ee0---84521596570.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210601082255.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/18084335354.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/vilomawilegagojupo.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089949c0da70---wololed.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/3329b5db0b1cd3a56ad0d35588baaee5/24969736894.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/3838917946.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/74104907929.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/11739905798.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d49543abeb---xajuxabubigafupoloxadenim.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/folona.pdfIn PDF document text
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/sipasufewabawejemuw.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/woluporeluxugurawonosuz.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/soroditajek.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/xereniwi.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/takemuzelewikodutiworava.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac84576b33a---44106226379.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/84039702084.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/1nuhuq2rlb92pgsrdt9rfun8c3/98056945458.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1612b2dc25ce0c---rogufum.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05121c5816---43832181564.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/96037059826.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087c666e6ab1---xagitega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=maciver+and+page+definition+of+sociologyPDF 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_off00013848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001505f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1505F 10968 bytes
SHA-256: c4d628d2e7a3ae15b933b193640fd8dc42b6ff120c21771455f94f6781d6364a
font_02_sfnt_off000169c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169C8 17872 bytes
SHA-256: 6c95b9035296e3552cd1d1794e3836a6252e2387df3788de0c8dc954f48cf3e2

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