Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c006cd8df4b4007…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 16:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b5034a5b9bb89a7942877559a7a502b7 SHA-1: d3b9438e877a077134266d1847e2d7bc9ba986b7 SHA-256: 7c006cd8df4b4007a9cb6761dedde200eec5ba547eb51b4d3ffbcbd1c66228c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=to+kill+a+mockingbird+read+online+free PDF link annotation
    • http://kfbma.org/files/fck/file/powupefanogofetumokufog.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/24927265115.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/wejax.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/91414660887.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/842872484.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/nivoniw.pdfIn PDF document text
    • https://ferropula.hr/files/63907491828.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139fce2d9602---9986135168.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/guvobepidadanebapepo.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/lulusivovanilubilobapi.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/36340799588.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/vedemajuxoronefa.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/gexijuwexodulewadonidi.pdfIn PDF document text
    • https://lesura.net/userfiles/file/zuwirelajepevonekes.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f4ba51933---pavesiligorabare.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131f792eb6d5---lukuzafifomuzi.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/pelum.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613093ae92b4f---tiwazizufexebopes.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/75789155243.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/tobip.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/40533239056.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/bufijufugiti.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/8d5088a8930bd54b6893edc45c88b31f/89192555524.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/fobinawekixevagoxewe.pdfIn PDF document text
    • https://alohasafaris.com/files/21148416645.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_off0000e3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CF 17320 bytes
SHA-256: 36bca9ea2a76add193c056f545a673ce44c72abd12c92f2dfbaa6c0962782dc3
font_01_sfnt_off00011064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11064 10748 bytes
SHA-256: 105bc0661de8ef438cd7240076773c9d324e450a8bf17df84a76dbde82d9b2f8
font_02_sfnt_off000128da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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