Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d859089511e0d6b…

MALICIOUS

PDF

85.6 KB Created: 2021-08-16 00:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4c1e78a217f79efdfe33b5b6eb44512 SHA-1: f2a5861ae253f53713ba9d4c0d6c7f840d516ebf SHA-256: 6d859089511e0d6b4af3ef6c54b37a3d68c7b606c9047c63772ee441fc0db1c7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and IP addresses, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. ClamAV detection and ML classification confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=fast+and+furious+part+1+full+movie+free+download+in+hindi+hd
    • http://srividyaastrology.com/userfiles/file/wekikarimajeveju.pdf
    • http://rld-carbon.ru/file/juresuwo.pdf
    • http://ideviceplus.be/app/webroot/files/userfiles/files/32564496302.pdf
    • http://www.kickcommerce.com/userfiles/file/vopozitajalofazozodejo.pdf
    • http://yuanda-boiler.com/d/files/bikaviboganerefepetuja.pdf
    • https://zegaoyun.com/calisma2/files/uploads/bomexebetigopow.pdf
    • http://tuanayapim.com/rsm/files/51406691585.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a77b694ec---66946894120.pdf
    • https://isleo.com/i_photos/file/7264416641.pdf
    • https://efnnma.org/files/file/nibunolisanivaxorepugizu.pdf
    • https://armenia4d.com/contents//files/16012399455.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ce88a143f32---tasefesura.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/47dd6237b1346706279bdead9f05fc7f/77940898326.pdf
    • http://dental-forum.ru/userfiles/file/52790719915.pdf
    • https://cecprint.com/images/file/larenorudumaxevog.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/1dcfbf70c3e111b8e5148b2d16db95ac/zikuzavivupiw.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607899224c22d---renetukezedatu.pdf
    • https://qnzar.com/files/petemo.pdf
    • https://burkina-businessschool.com/business_school/uploads/file/kupajamumubisewev.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/e2n6eqcmm05bi1egrbm6sjk040/10474473942.pdf
    • http://studiofranzoni.eu/userfiles/files/8120287478.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f64fb7703---36923450288.pdf
    • http://n-production.com/upload/fckeditor/file/xidokevopupaj.pdf
    • https://samoinstitute.mn/uploads/assets/file/zakuvabadexolofa.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f511865aacc---89086296907.pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/dfa86731fe6d4f437daf0984cc07e9d8/gofopekidalijabobon.pdf
    • 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_off0000e9d5.bin
2e91c2186f16ca7714e072df3cf72d54917311a7f69ad7eb07bc5d7fa91929b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D5 11044 bytes
font_01_sfnt_off0001036e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1036E 16792 bytes
font_02_sfnt_off00011b80.bin
9a89a6a2beff283d5c53927ef61aaaf796ff4f90d57757e79a2f34599c259e07
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B80 16748 bytes