Malicious PDF — malware analysis report

Static analysis result for SHA-256 980c6285723ed619…

MALICIOUS

PDF

71.7 KB Created: 2021-09-01 05:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2beab7a1ea2ffa4d1556749aff2f4ae3 SHA-1: 9eed38f47ceef655abe495572e4eef7f937a8d8e SHA-256: 980c6285723ed61924b0f0e626e008ecc6750aa8b7ae01756e1dbb72bdb07bf6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised CMS uploads or disposable domains. This pattern is commonly used for phishing or to host secondary-stage malware payloads.

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://synerhu.ru/uplcv?utm_term=ifs+function+excel PDF link annotation
    • https://amd-export.com/site/upload/file/27547188609.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/54554107826.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac9c673810---vovugekaxovis.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/8017964406.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a4f3a547d---parogajizetabirilosuwigaj.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/n1n915961vkrjuh5c838puvn1t/punuw.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca783f2c92---42776467186.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/pupumekokazutusugatafaz.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/023d5d0518e453167565d24669e516d5/bigebinokotedu.pdfIn PDF document text
    • http://vhs1970.com/clients/873287/File/43446569326.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/91576190099.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/90300527747.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/64519912624.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/k7a3aop6vamiap66i3la1ioni5/dusinimitunu.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/79219c1130035dc583b8c24ee301773e/venutuwexosanarow.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8fe5601e9e98f8d0c9ec2f92c9bec72b/sudisifenexuzipugovafuva.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c8a81cbd2---99857346229.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/v23iqacj0tnqkuqniu5ndsf4dm/vajoxatisajex.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ef961070c---44006435483.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/kawakokikolitazit.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/vefenaxeser.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/bemerodererajazalufegozop.pdfIn PDF document text
    • https://robertbah.si/files/file/zanavimisave.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_off0000b87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB87E 10220 bytes
SHA-256: 662d4260676b5bbff5b59e9d401ca359e9d02ad5064a6e0402c30b1680f33df2
font_01_sfnt_off0000cf93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF93 16060 bytes
SHA-256: 192b8871df9066bad1138067ff459e8dfde2fd44f8dd6fde69e38d14cd6549a3
font_02_sfnt_off0000f835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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