Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd840369f9e6281c…

MALICIOUS

PDF

95.7 KB Created: 2021-06-25 22:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 878b598402bcbd057db0af2a535d14c6 SHA-1: a1dc184d7dffa669142314364ccc8877852072e7 SHA-256: dd840369f9e6281c9b1358b573f733385a921ec3084a583ae6551af0bd68cf92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a large number of embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting it is designed to lure users to malicious content. No scripts were extracted, but the structure and URL distribution strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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=call+to+worship+lent PDF link annotation
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bc5c81ea6---totamovori.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/40987292093.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/819d8a931fc4d6ab7eb48317982775fd/dajutomoxogopi.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/30638795319.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/lazupojize.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/sg1nqakg13mkvne68nckof1ebq/pararamuwemetajifadulise.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc26a92c856---kuzazesebofokur.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef451ed2d---17747265246.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/f28cee91118379573a352bb206e4bd38/tidolijanetunub.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/cf62f15ccbd206bd20b1509300481402/28164551018.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/4b2f59fc89ee72ab137920ac0648e85c/zogala.pdfIn PDF document text
    • http://goref.ru/files/file/83923647487.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/rapatijetu.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160764430076da---burumapapekusuribudodel.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/si690aigu2edqsann2f9b97460/vojuxowekuzano.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/23863995160c2a34d87c86.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/4a39ed95917a6b45edc5b122bd570bb8/pekimutemusagedewigopi.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af5ef637c3c---pezijoxezadisivarujaza.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b44901988c---24333967804.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/10469394323.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/jakegaf.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/27819822922.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/aaf2618fe6ff5bba89568da046849611/7222308142.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078721d52e16---xusokupuwuzewafiwepazu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11303 10464 bytes
SHA-256: 0a00415b98ee74cde7ecc5d1740cefa0deb80bd8bc28a4e6ef8ab135b5017019
font_01_sfnt_off00012ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD4 18460 bytes
SHA-256: 9d3379e00038308495477c3e8880f6bed878e333c297166af8132ef1602c0b7e
font_02_sfnt_off00015a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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