Malicious PDF — malware analysis report

Static analysis result for SHA-256 836b388bce28e94e…

MALICIOUS

PDF

72.1 KB Created: 2021-09-21 07:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 40b2070e980c7c9f8e955e97af7622e8 SHA-1: f891e2e62caafa01f0c9e840bbdc5e1b836c3182 SHA-256: 836b388bce28e94eb4da3a9e999360d88531dd92b0f35601b349eb48eb360c46
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, including compromised WordPress sites. This pattern is commonly used for phishing or to redirect users to sites hosting malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=molecular+biology+of+the+cell+6e+pdf PDF link annotation
    • http://originalavto.ru/userfiles/file/zowom.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/tagaruraperewi.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/gubatafenenixer.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/bimujarimawe.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/nimobetadasi.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/damopixesezewunezalajasef.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/tinogupirazavagaw.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614626a25ddc6---51098529762.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/95145290834.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/60389164415.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/gujaxaj.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/lewegarik.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/80732568838.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614744380fbee---rasomabisudilisoluvelab.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c0a2bfeb2---31064376470.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/babexafadumunop.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/folokulusuxasedosokoz.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dru68iukqqkv0psgf3fr5k1tt7/47762927611.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/segixififid.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385084b1d5b---85549981804.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161339b8963220---nujobujuwawamopogova.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/6114796823.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16144a261d2176---gajasukofujati.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_off0000b8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C4 15720 bytes
SHA-256: e9eb2fd3d3b85d95d31c12d0f4eaed0acddc68a1b06c03f98fe24b55e0f18a22
font_02_sfnt_off0000f8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CC 11144 bytes
SHA-256: 1c034ebc784444140b4d8eaa1d3b679257b22a4386be42fb74199a2d72cb7059

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