Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b4499a49eb8278…

MALICIOUS

PDF

83.8 KB Created: 2021-09-15 17:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 502c44f082c5296abb05aeb3addbeab5 SHA-1: 715a4c6fee7d1888fdb797dcde6d6ad20c36226c SHA-256: e3b4499a49eb827846aadaf7e0299c38b9b86b3865a48488fa003dc7906ef685
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites for distribution. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware delivery mechanism.

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://cebubigsellers.com/userfiles/file/84770174928.pdf In PDF document text
    • http://maginsaatmetal.com/resimlerfiles/49560907002.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/86857495383.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/janupedalomidubotura.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/70695548029.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/48957754642.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373f5c6c628---94988851265.pdfIn PDF document text
    • https://clickbox.ro/images/file/28349456061.pdfIn PDF document text
    • http://cartopack.com/Images/file/rarefojepapuxixu.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/85609083104.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/kq3ieel46lgh31kotk8i5t7rui/95957302954.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/guriguxeseratudirige.pdfIn PDF document text
    • https://scalping.ir/data/files/file/81618147515.pdfIn PDF document text
    • https://betsin.org/userfiles/files/saxubo.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/muwafagexuzuragu.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/48142777925.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/73994353100.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/61081616933.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/64248816641.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee8a6c218a---mukikajuzavu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f1bd59286---milejet.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/wakeperemafepuregexam.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/jaredotiguxasalaxosug.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/67283211866.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/puvonifaparavipowigas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=locker+codes+for+mtPDF 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_off0000e26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 10280 bytes
SHA-256: 893d5536e9bf67883cc34739b6e4bde9126428613699d6e9b0a2668a955d4031
font_01_sfnt_off0000f99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 18508 bytes
SHA-256: 0c836f3f85d73a6abb412e736f811d0cd9ce4d49e1a5e3d2bcc45bf65c436c31
font_02_sfnt_off0001297f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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