Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc80504adc034cea…

MALICIOUS

PDF

85.6 KB Created: 2021-07-29 20:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c8294d52a99f0f708c8b73debc92c2b2 SHA-1: c8155b0e10a12fce05be2ad7be417080f2dd400f SHA-256: dc80504adc034cead75d18ba1a00ca2bbdef5ddbd9ee6df7795d1f6a99941e40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous embedded URLs that point to compromised WordPress uploads and other disposable hosting. These links likely lead to phishing pages or further malware delivery, indicating a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=blood+vs+crip+shootout PDF link annotation
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45ba3a8943---xeferaviwonufowoxigez.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/47090357924.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de0113c64c4---10815532776.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/83ddb2b44f4eb09565c0d40e2da897c6/mowitamivulesenemaw.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/lojizalikovezemenubosif.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/a71bb2cc461a667bfd472539faf5e621/47183763568.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/dekudafatopujipotiwi.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/reditanokatewodupu.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/winil.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/21332435896.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/simujekemonizedu.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/54387187851.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/xebinivalotifamep.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/busoroxinizalizovo.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/xopugarij.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609d422c69167---voseduredojol.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160900f5bbef7e---nurivaxotibabizub.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/qqde1lnmi5q0sdp8kh5r9cgh1g/vezosodunudekesum.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ed08e0e1e2bdfd3ec2fdb00bebf604f8/sijasinezovegow.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210715201148.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713b6fec0bf---75892128049.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/risiwuloparavaluto.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/tijerane.pdfIn PDF document text
    • http://pestcontroluttara.com/ck/upload/files/mirajinozajevikawetesu.pdfIn PDF document text
    • http://aps-mes.com/files/file/27455841135.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_off0000eded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 16592 bytes
SHA-256: 46fea4fcee0819e26adb54b5e9bfb08d0bfcf0e1bdc4523163666fc4e6d63bac
font_01_sfnt_off00011878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001308f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308F 10432 bytes
SHA-256: 92b7bc2bd770b55de239b325bc09d808cbae552b7f8abeca47385d7150e157cb

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