Malicious PDF — malware analysis report

Static analysis result for SHA-256 99bd99b438930404…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 05:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0051fb3218e22e25dedccf693b913fd8 SHA-1: 81524ab78fbe110ff262546873dc5d3fa340f750 SHA-256: 99bd99b4389304043333accc0783c014ca7bbe51eead512a35b97a6e7deab521
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=1997+jeep+tj+service+manual PDF link annotation
    • https://helicopterleasingservices.com/userfiles/files/xokuzi.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/32439160047.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/31p5avd81gh1njvbdbtm74rg56/tewinumaxeneju.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/pokovitodetefotetazukepe.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/pebinudezijakupek.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/befelowubuxexegumu.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16096cb5aa49d6---mazog.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/tomidaduduvulemikek.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/9eff604c5cd47c3096fc31f2d444148f/7243773736.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f487c88e722---kabugavazabij.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8101ccf1b0c180e95f05d22b22b3cfdc/94235246401.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988c07e1b95---rasigobudole.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/48925802682.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/zotegofawuferunemiku.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607943c103ce5---boromexezub.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/a5759ee9b835c7a0c9d18810f07792fb/zapobupanivodevizonaxal.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c98b73359d7---83661099830.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/64989304486.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/964c5bea11293c966980be20327a4672/84633624397.pdfIn PDF document text
    • http://cochu.net/resimler/files/73374720551.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/4048977888.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/18864359588.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/zebavowavasifusoxupoporu.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bb4bcb6bb---78975647055.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_off0000d339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD339 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB50 10884 bytes
SHA-256: 53ad16be1ee55344404ea64a26e0d2b0c66f0afa2bcfcf58ec79476477a5d122
font_02_sfnt_off0001048d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048D 18676 bytes
SHA-256: 1a22b12cdceb11045345cebb5f092bfb437734dcea7452d842a31d19234a105a

Open this report in the interactive analyzer, or submit your own file for analysis.