Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b62cb4e18bf4d8…

MALICIOUS

PDF

110.1 KB Created: 2021-08-25 23:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 34412022c8b6c519651375a9eaa9b104 SHA-1: 4f24db3e034b11480e61d8aeae6a7bb280cfcc00 SHA-256: c7b62cb4e18bf4d8fb3300f6bb58cb0de9971752f4c858e3065d0519cd6d9fec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The document body itself is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://nomylo.ru/uplcv?utm_term=what+does+the+term+unicellular+mean PDF link annotation
    • https://bravo-hk.com/userfiles/file/90567241249.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810da32249a---27909092147.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/fonisoluxi.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/42117509896.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/zomadafotumevelifaxuj.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95c9f30636---80581433922.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/tedudevuvefemuweka.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/6efm0bba4ojcep3v4qedr3vkfa/fazugoni.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3840cbf52---bowitimikirimadupajir.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/xenugirixemibaralulonov.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f6429c64b---74879272240.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/41874761739.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/kulodalesarigax.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/4b4abb659395dc05d2b2ae2c318de13a/49374418172.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc184b17519---vibukojomusiju.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/13a1b7c9f547999c6916c5b67878c817/limiwopasotupovoxalobur.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/76522d181a45ca06fea715fd73f721e6/somixoxejameduno.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160987dee4c895---91111740390.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/i1v4cr2s5m7agnr9qr55lchcns/fapimejepefin.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/josaru.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/xijozabot.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB6 16984 bytes
SHA-256: b7ecab591a29c9f321dcf4179d6e64a3f54f3f8150cd1e68a53b24fafe265f59
font_01_sfnt_off00013436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13436 2864 bytes
SHA-256: f1cbe3a67d46ecd00544073cffe85a80d1401e7ba2ea62af1dd2a7ccaf2a7a8a
font_02_sfnt_off00013fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD9 21584 bytes
SHA-256: dfa3b25a07050f8841698f6b1b6e7a01c8f5a184d13f4657ec82cd6050f25297
font_03_sfnt_off00017670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17670 10728 bytes
SHA-256: 5597d9d7a0cf570e4ac2d1fb8a98c9c77967e2a05091af91522a2d860acaa084
font_04_sfnt_off00018eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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