Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7835d8f543c885…

MALICIOUS

PDF

80.8 KB Created: 2021-07-04 09:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01f081b66b1b014a43d9e18648b01020 SHA-1: 947e2b5458811894e7e75d810f9687bbdfbe964a SHA-256: ec7835d8f543c8856311ab84cb2dbf85950453a20df4802f23aefa751286079e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://beiwendq.com/userfiles/file/34921873066.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba1c1f551---koduvuz.pdf
    • https://briljant-maleri.se/UserFiles/files/rorigowopelemakalu.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/517c32db2abec0ce287d404a987b82ef/84792386380.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16094cab6abef7---vuzeredorujo.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/3dd50834b563f5739a57de76453e90d8/45863776315.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/d7b4d20bcbf40a00e1e4c072ab2b851b/lalevorimukibad.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/10b7bcb488a61db77e6cb8a5fffe3dd0/83024065725.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e00e25366---35117056502.pdf
    • http://teplolux72.ru/upload/file/sonelajiniwinimakipin.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/1ad9deb24db5020df105cd99f67e368e/71916020334.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fde48915ed---59488236384.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e2746e8ef---digek.pdf
    • http://scro.ru/pic/file/bululagida.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/4f544e6c1e64b2aca29aa6fa996ad949/90717726260.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c39b7f661---tewij.pdf
    • http://x04ydivan.ru/userfiles/file/89683885191.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609252ff4459f---31085884539.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db41437d16c---47531622684.pdf
    • http://glamour-nsk.ru/ckfinder/userfiles/files/tibimenovatukevuzadu.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff13e93ae7---82493223622.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=place+value+and+face+value+worksheets+for+grade+6
    • 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_off0000d96a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 16792 bytes
font_01_sfnt_off0000f17c.bin
b1a39f2fb582606a5b84337a0685553f59f857109966d72f8849affdf809ee04
pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 16308 bytes
font_02_sfnt_off00011bcb.bin
c3c6d3cf4d239cf3b42227aeda1faf5f7d23bcb84a6589402a587f02c3a5a106
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 11176 bytes