Malicious PDF — malware analysis report

Static analysis result for SHA-256 d29c8f00d1e196e4…

MALICIOUS

PDF

85.9 KB Created: 2021-06-26 13:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74973e1daf227f315a82cfec30e230e8 SHA-1: 75e8e9204cfd211f23c933542d4cef5c2adafa60 SHA-256: d29c8f00d1e196e4eb5d2b306e1b67c140147be284931ee34374fcbf7ef13f73
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which appear to be compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to distribute malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://hanhthien.net/uploads/file/94193563279.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/4lhjk9gh5vbqa0tebdnfp6ui1b/49367682101.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607c317043d80---2828417244.pdf
    • https://nslogisticservice.com/userfiles/files/42687190113.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c65d6cbf078---gonegobul.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc5413253c---99473466526.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/e10c4bf9682ea61c0be61315d03fb8c6/78623306405.pdf
    • http://slsnn.ru/content/files/87327754018.pdf
    • http://ylpcl.com/ckfinder/userfiles/files/tunidenasatame.pdf
    • http://firstcuwire.com/file_media/file_image/file/zewozef.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/d4359d46f170888242a4fb9a0cab8d99/rumirax.pdf
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/82263068554.pdf
    • http://innotack.com/userfiles/files/bosamatirusikopekidi.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/i0iom3umi8jp3oe4ecvlc9e023/bekakavakexe.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e138e6f1756cc2ac4ef745e99e00524c/mebuxewanuwajanepezedo.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b2a26fa8a---xutidujeb.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160954f57c03ca---6503301073.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c0991ee4ac3---kemamitiwigebewenaluviw.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/8ndefs1qmmgstq6g1jcrmju130/69718133222.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/fab7e1b6f306026ea2922aaef056b8a0/dezetup.pdf
    • http://xaydungphongphu.com/uploads/files/bopawerobonatarusu.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c976d14e0fd---47693336172.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=40+mbps+to+gb
    • 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_off0000eb14.bin
48e68b0b5c7a3a695be08e5716dd85116dee419e66919db0a1c9cf2e2428e0a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 10200 bytes
font_01_sfnt_off000101b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101B9 16792 bytes
font_02_sfnt_off000119cb.bin
1da39d2e6f55c36af009b3ebdfd278afabc027fe881c135bee9f888814175a6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x119CB 19072 bytes