Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab6b164e815f5ed…

MALICIOUS

PDF

92.9 KB Created: 2021-08-03 16:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9c881569c01661d441b564ff655f838e SHA-1: 45bd923bdf421cc5cffcdd72144ef74be151bd86 SHA-256: 8ab6b164e815f5ede92f32039af65a6f167b5db30f2dd7ee73103add0753ec03
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing pages or download further malware. No scripts were extracted, but the extensive use of compromised domains and link farming heuristics points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://allytemp.ru/uplcv?utm_term=monsieur+ibrahim+et+les+fleurs+du+coran+book+summary PDF link annotation
    • http://www.deewanalarab.com/up_imgs/fuwijuxiribekemireto.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34a4d9ec8c---63163709637.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/8fb9dd391d56e63abe498a65c614b9aa/doxiji.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/b023ab9de6cbfd06c20a7d828672c4f7/najedo.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609440bd2c0b6---6599345194.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/ddb047bf7273b12794db44213deaa3a9/wevazuj.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/jilagovibaxuzuliwiwerap.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/h7f7agaa65l0g45mljc2ahcs4u/69483639176.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/66a45e5c70598d01370d71c853b3f87e/29173197644.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a20bc2182---kusedi.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1609142b7ccc8c---29398382468.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/11783922746.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/wenudapudaranonanovovode.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/40335778441.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5aec4f38ed56a3ef9ad48d74b7bcb366/vemasatewefa.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/17471186406.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/96124074600.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdefc1e46f---zevetegidoxazivoverawax.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/44b47608aa266611a80a6dfa70a6b561/40237776084.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607603e4347b7---dowibuxileduguwuxibolupo.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad260843c54---pulevefozuposidataj.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/zejuser.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/20937061293.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb63bb3b4e---vimeputisojubofeme.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/686a8178a12b680eb9a87e8836ddb47c/fuxarojosekokagu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AB 11180 bytes
SHA-256: 7b0181cc45e4d9f4b5f73b6650faa40f5a90c64b817e7d2c2334b9480fc42dd0
font_01_sfnt_off00011fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAC 17628 bytes
SHA-256: f79dbd096116b256e38577b6d6d186fd043b2705fb1176cc8e952f3a2eb0bb7a
font_02_sfnt_off00014ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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