Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7db8a393fe17d54…

MALICIOUS

PDF

91.0 KB Created: 2021-08-27 02:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 177e2d5e0d0823c1e8c1351ca6aca3fe SHA-1: 04692f891eedf02e941377ebe5b36e8475afc7b3 SHA-256: b7db8a393fe17d5421107d80e845058c58421d1fa5dac66600a0cd5edf92a8d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised or disposable domains, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan PDF. The presence of multiple links on potentially compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://archism.ru/uplcv?utm_term=small+hive+beetle+life+cycle PDF link annotation
    • http://nanopena.cz/upload/file/60454416841.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/dafuretek.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6cb67ee92---waxenuwezanepojarip.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/4ft4hdr2ke2nifif3da0n8g5r5/xemijeba.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/15573284191.pdfIn PDF document text
    • http://apcmagon.com/userfiles/91987735664.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a8b31bdf6---71418502344.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/85804913587.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/zovigepifixokizos.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16088bea3cabb2---bamejarikovaweta.pdfIn PDF document text
    • https://digiconelectronics.com/media/96723516389.pdfIn PDF document text
    • http://d4scanada.com/clients/8/81/81a8d3ecf29e0a7d9042e8364394d873/File/87209388005.pdfIn PDF document text
    • https://businesslife.com/content/file/moxobemerozuroduvurepumum.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210804154717.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/denakaditesumedorovamefod.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ik52lpnopred96421dvfoiq9q2/22343013414.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6fd3b303e---89264234779.pdfIn PDF document text
    • https://coil.hk/upload/files/wolaluzisazuf.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160852338eaee4---95922668107.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/696b7b861f17ec175278bb65b9bc22d5/mevosudajuzemo.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021081707382456.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/jawovevuxukez.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ab37e56c94400f425a7f3e0aa6d3f399/dezafipafemibaxuwinenu.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_off0000ff03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF03 10504 bytes
SHA-256: 4cb45e50a1510fc9675f6ce2b4f9aac8340d5d7a08c649cb0b286a884c2c20f0
font_01_sfnt_off000116ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EE 18100 bytes
SHA-256: c4fb1808ec234d75c68703e1e351de13d8ec095c76a7f9c075106a4f35a63103
font_02_sfnt_off000146c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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