Malicious PDF — malware analysis report

Static analysis result for SHA-256 951a2652eada4f5a…

MALICIOUS

PDF

86.7 KB Created: 2021-08-07 12:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c836194918e9336b152c99e83465bf54 SHA-1: abd66aaff411eaf2462779543c8d482819d0de20 SHA-256: 951a2652eada4f5ad39714857106feb879ee94634f81d26893d32b1b8987d5eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The file is a PDF that functions as a link farm, hosting numerous links to other PDFs on compromised websites. The presence of ClamAV detection and ML flagging indicates malicious intent, likely for phishing or malware distribution. The heuristics suggest the PDF itself is part of a larger malicious infrastructure, pointing to compromised CMS uploads and disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/39f3d1d727193976e4828201d0bd7218/votoxijugoxolagugununesa.pdf In PDF document text
    • https://interface-graphique.com/upload/editor/file/97031634143.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd40361b568---42181105974.pdfIn PDF document text
    • https://tusenfotingen.nu/anvandarbilder/108/files/69338798318.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/541b10mdd6nv3oki2na6640cc2/fuvipejumapevexijamimugub.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/06ni7cj5okci0n1iln5modlet1/99135757207.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/dudutewu.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/60376065975.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b2a97f610ad081677572b940d2bb0482/11967814033.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/g9rtfpddnhk2vvs5qjqihhk0tn/87988578168.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a56078c04---xusetaxedebaj.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606f79a1a85c3---16504581557.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096567677409---pewugojow.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210727151931.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb3324eeb6---58594123236.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/9929f8c3119d1ae4bb2e19d9e213f8b4/28316958607.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/dumuzat.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60c797e5ff---gitovivigevedezanopo.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3cc8bf9b012a89ffa8b8bee267ebacc7/29644827939.pdfIn PDF document text
    • http://cartopack.com/Images/file/78795629958.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/xorisapusixidu.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a0f98c6c1---10189587996.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/39872210396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=alkaline+acid+food+chart+ph+levelPDF 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_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 10688 bytes
SHA-256: 6e9060a1baeb176572b39a3090057103654aa027f14e70513cb38f147eea3622
font_01_sfnt_off0001086c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 17328 bytes
SHA-256: 73b5f52ff25de28fdca7901aa6dd63709606865fe6126bc3bb1345f270ce8939
font_02_sfnt_off00013550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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