Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb097618651e0ca…

MALICIOUS

PDF

75.7 KB Created: 2021-09-01 04:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a8000cbe523db6f9aa4e8015bf5f4163 SHA-1: 5fc23f19a63d707fc52239ba94433c4e9aa8cdd2 SHA-256: bfb097618651e0caafdd3d57dfb5a1e9dd930b735f54872bb590c5b828f3157a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised or disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or exploitation.

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 http://hosteleriayvending.com/ckfinder/userfiles/files/gelaviw.pdf In PDF document text
    • http://ediljolli.com/userfiles/files/tekazizojabegex.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b1dbb7cda---87665063277.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/44599327890.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c796440dc8c---58424523870.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/donobolor.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/25170505266.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/kimamovusuxelig.pdfIn PDF document text
    • https://hiroyoung.com/data/files/33288448308.pdfIn PDF document text
    • https://tavio.ru/files/file/kadukemopowotafej.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-19/20210519002116612742.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/75497533517.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/files.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/4683673322.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160908b725eed0---89020114250.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611405e865a97---82654042034.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/mopojuwaves.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/kezejomaxuteleb.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077641b9b7c0---kekirozebepulotopuzofu.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/831bfa749f15549874a88106c8d75a92/posusugexave.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/wuketaxalikeloki.pdfIn PDF document text
    • http://e-sportis.com/images/upload/regurabeboni.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/gurogulefifupokuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=sd+movies+point+bollywood+2017PDF 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_off0000c5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 11116 bytes
SHA-256: 3d6a7d9bb6ec336c86ef02594e6a78929029bbc4be4f9b46337f72d9974685fc
font_02_sfnt_off0000f7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A4 16420 bytes
SHA-256: 31d89c879bae2c9cb8b4b9fc60b2f685944d8e298f0148f503a4002594eb892c

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