Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d35513baa3cf690…

MALICIOUS

PDF

74.6 KB Created: 2021-07-04 02:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2d739a0dc03e97b90e9caa28211ebf0 SHA-1: 106122fb1acc9d892990583ea51ad08ca34d721f SHA-256: 5d35513baa3cf690fb9350ee5f587cfaf87d2d3eb671a3a9ad4be933c01a2d54
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting, suggesting an attempt to obscure the final malicious destination. The presence of numerous unknown URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://mega-gold.com/userfiles/files/96744865853.pdf
    • https://intrigantka.ru/images/userfiles/file/68158408677.pdf
    • http://adabaskimerkezi.com/upload/file/nirelekud.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/8qg5n8fep873eud1ajvr4cicmn/16728453754.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088057462cf0---bikujawifod.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081003e1041f---39934270612.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/3f0d1e63531b7b89d062ecd3b48575c3/vuvuzesovibizogumerij.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16073857ed1e83---43283539149.pdf
    • http://hrt-foto.hu/_user/file/68709570636.pdf
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/51720590276.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9912b4b94c---20767617722.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e0dba5425aa---39830829501.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/5782d6afdc1c87e789ad335609ff1d96/butegikaneraxokapipoz.pdf
    • http://fine-cottage.ru/userfiles/file/lusazo.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dab2ac520b---vemelezovugid.pdf
    • https://alnahamgroup.com/userfiles/file/navofuxewiniv.pdf
    • https://alutat.com/data/file/muroratovezukofi.pdf
    • http://denis-lefebvre-services.com/fichiers/file/98891496355.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afb118d6819---funejavaxetosokiderafop.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16071a7373e741---15562822575.pdf
    • http://eotp.info/sites/default/files/fck/file/xozosite.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=c%2B%2B+primer+exercise+solutions
    • 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_off0000be6f.bin
d7cbe500f5772fc89c640f0104584040a1bcd8cb6ae36fc4d01afe56002a88d5
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6F 17068 bytes
font_01_sfnt_off0000eb6a.bin
c91f80e7b53feee89171cec5d9965b7c66178d145de1557543419de79cb98382
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6A 10608 bytes
font_02_sfnt_off000103ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103AE 16792 bytes