Malicious PDF — malware analysis report

Static analysis result for SHA-256 63111e878390d740…

MALICIOUS

PDF

84.6 KB Created: 2021-08-25 20:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2551388280664fe9f8e89be04de5f3b7 SHA-1: a07317086cccbf7116f20f01050c5851cc19841e SHA-256: 63111e878390d740f5a1aa7b47245ed8046caad9cfd1b2125de0a0f83a512c18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised CMS uploads and disposable hosting, likely to distribute further payloads or phish for credentials. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/8ebd52e9f59980f7c94ece6026abd02b/56591212812.pdf In PDF document text
    • http://levant-tekstil.com/other_files/File/webogidizavogevodum.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/b7f674895b935d55e3f6d68395f02bd4/70608886703.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/89ab29cffec1d3fe8051e47f0a702826/18059636682.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/11120969984.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/96574316199.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/79253386274.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/85766140683.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e8813ad3---40437733846.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///40078667337.pdfIn PDF document text
    • https://kultmotor.hu/images/files/woloxexanubokotavawunerez.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16103e4a645933---57100005490.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/kopalulapozewumijeradib.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/v0cc289okngpv975r38dga8oo3/kukozatawukasun.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/napitegexapuzaj.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/woluwex.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/74a65845a4461a49414e5be15389debb/kebevavubamuruxe.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/59d7d37d7985db5d4e269958cdabfaf6/2578962792.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/nunewuxi.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/zexoforixi.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/40236922561.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/7474604091.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/11420695824.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160771913234e2---4455559176.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/57553918444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=falling+out+of+love+in+marriagePDF link annotation
    • 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_off0000e680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE680 10532 bytes
SHA-256: 9d32448b9001bd6c7a3916bf8e076d30ee8f20067fbd6961c52798f851fe7026
font_01_sfnt_off0000fe72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE72 17556 bytes
SHA-256: 12f1758df7c74d2d1b34d700412fc48e46980bbab01e4454986a7f081f9444e0
font_02_sfnt_off00012b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1