Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8fba8ff3505df6…

MALICIOUS

PDF

94.5 KB Created: 2021-06-26 14:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e9a580e2adaaadfc32aaac4f2e6f2c8 SHA-1: cd679f4cc566613ee8a1bed86425ebd16052b50d SHA-256: 9b8fba8ff3505df63682d08b883149d44a34ba6c9c34b60a41b268d6c423f568
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were extracted, the structure and URL distribution are consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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://pypconsultores.mx/userfiles/file/miposiwonigavawisixilebo.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b855b177fbf---33246170225.pdf
    • http://momsystem.ru/public/file/sulezomijavafazipujurofi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec9b3f36aa---83187349456.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077771c7b613---wobuxomupajanedutakutajag.pdf
    • https://computerzone.pk/file/3382507545.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/a71022e2d43fca2b9eea140103bbf4a5/bugatepovuxumalolumej.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a450ee100d2---17954832362.pdf
    • https://motelandratecuci.ro/userfiles/file/87848521566.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b2802c07607ce1d728fb80f8bca04655/52415063549.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b85c4bcc19---kajexiwofaragulukefonebib.pdf
    • http://anhuifan.com/upload_fck/file/2021-6-5/20210605151728220208.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/42bf8c6e8c61e85967eeb15788443799/jomupisorizuf.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607492677f99b---17640771833.pdf
    • https://marjoyunlar.com/calisma2/files/uploads/pujogegizexufudutupowap.pdf
    • https://mmagame.com/userfiles/file/54620468059.pdf
    • https://paklya.su/design/img/upload/file/90981518843.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4effa238f6---47148523006.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/fe599ae47666d5fe5b344c174832199b/gugodaxubijudakavezanodu.pdf
    • https://mimpishio2bet.com/contents//files/pogunanabovozomalosaz.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/afn6cckhrtaevp7sd5o0knjbpu/zibabimitix.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=and+then+there+were+none+by+agatha+christie+pdf+download
    • 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_off0001097f.bin
933afd664ccce98572f6a5dd3157e5e79aa1ecaed7a70ead9f2990ffe0330e02
pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 11220 bytes
font_01_sfnt_off0001235a.bin
d585192eae174c5fab6265861c00d65b2b09b407f60dbab5f6c71c912e68eeb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1235A 18440 bytes
font_02_sfnt_off00015260.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15260 16792 bytes