Malicious PDF — malware analysis report

Static analysis result for SHA-256 6346db27b60c57fb…

MALICIOUS

PDF

93.7 KB Created: 2021-07-07 03:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c993eaedfe88885c331330541b107343 SHA-1: 7a453d3d72183f799f01303c4afb879627a732e5 SHA-256: 6346db27b60c57fb5eabb024fce8d2c99519938aa20e1901786f1486afdfe761
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which are flagged as potentially compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://doo-san.com/userfiles/file/20210508211041.pdf
    • http://airsoft1.ro/files/file/rilovelivuwof.pdf
    • http://peaceinsrilanka.lk/userfiles/file/81168691402.pdf
    • https://audreyheselmans.com/_files/file/xepipapuxutasadagox.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/ecae2856d4c6835a784e02a4b4bb6e76/98347228912.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/03f9157adffa705e0712b7cc120b6fbe/32116890535.pdf
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/51541778163.pdf
    • http://www.hmcpacking.com/uploads/files/43536227377.pdf
    • http://www.bandungmesin.com/file/49018161152.pdf
    • http://bannails.com/fckeditor_userfiles/file/7830116473.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16072d617afba8---rerogojakevilotiturelo.pdf
    • https://apz-arte.com/ckfinder/userfiles/files/juragipuguxoxeraj.pdf
    • http://bosch-service-center.ru/uploads/files/belezedimadofux.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c251e59f6---kadamom.pdf
    • https://bustotoronto.com/userfiles/file/papexuwapifitima.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070b3ea4ddf4---76736451374.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160854f815652c---limiw.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/d15f8ebac4e21fcc34a6982390290321/61322240698.pdf
    • http://www.aadhar-interior.com/userfiles/file/97156660524.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738c858ce33---pamonafegafovujo.pdf
    • http://soupworld.de/upload/file/vasutizumikapomenoluvebem.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fd84ccf18---daxeguse.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/bo5aus6f9jtju3l0bm21b7mbca/lafomowidesalinujitelib.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/f9e4243624727e16892bc881e9e5f61d/zutorefod.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/33542d02b557cb248549f0e044e087ff/xisafewazalefixalon.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=full+movie+stand+by+me+2
    • 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_off00010cb8.bin
9f8555d4ec123a5d1fa58090e6baae567332183ac0adfeda8736bf8593e54d0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB8 10828 bytes
font_01_sfnt_off000125c0.bin
12edc9c6f328c1435ddce44ffccd9403a05acbf0bfa4b68bbb2c9c45df16bb2e
pdf-font-stream PDF embedded font (sfnt) at offset 0x125C0 16732 bytes
font_02_sfnt_off00015165.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15165 16792 bytes