Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e50a5c874d0bdf…

MALICIOUS

PDF

95.8 KB Created: 2021-09-01 21:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 70bc676d709465e4a13166deefe4cf24 SHA-1: f1bf56220bdb93a63a843a18256e359b09325d85 SHA-256: c1e50a5c874d0bdfb6adf09410b7abe63efaae87555b61fa050826f5a06662a5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm suggests it is designed to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ketchas.ru/uplcv?utm_term=commvault+backup+interview+questions+and+answers PDF link annotation
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/xaxikekunivifufar.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/nirorifigu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160701f1f24808---subupesirupi.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/12587747135.pdfIn PDF document text
    • http://st03.it/userfiles/files/zepuxofipuboluwobo.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/defa30f901f3522be6a7f1de78bdecc0/lamamiwani.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/acbd9c98f3734be87ae2abab49483f53/64670730026.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/s2vf6ttcbkv59stqilthrkip34/68549851647.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc42367c439---5974877939.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/wodepiji.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/nedexenedaditipufojesoru.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/10622051244.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b145645b11aad5e7792c1338046a4edc/62411402972.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/91800fb8533820565a5077a15b680040/dadevazoxuxuj.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/q8s0tt2ubo8r3149l4lrksla9k/26475193512.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/jogidinubanurevate.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/dafuwabipij.pdfIn PDF document text
    • http://spiregene.com/image/files/20210819_050920.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/57880801442.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe71dd2ad2---lagida.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/pugezowodux.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/grn55tsemtgrfu4dok9rfh71pv/mularotumuwijoma.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/875823f26fe307c5918b4d8de063985c/xevotupekun.pdfIn PDF document text
    • http://brlairport.com/images/file/lowurivazijoruzaxuluze.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/favixevov.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607714cf54db8---1746914919.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_off00010d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12512 19548 bytes
SHA-256: 0745fa6aaf7009cb701ec1e33ac8aedbaba4ed71c94c14cccbd6b43c6006ce07
font_02_sfnt_off0001563d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1563D 11336 bytes
SHA-256: 715dbaecbdded556cdb45c380cd86cf8564c1bca87c180397bf1b881132ee155

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