Malicious PDF — malware analysis report

Static analysis result for SHA-256 265343eff3552b0a…

MALICIOUS

PDF

74.4 KB Created: 2021-09-06 14:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 979c3448ebafa726e173f6ac15f86f06 SHA-1: 01d71a2903047f892a5007dc5a3eb8b5f71f8e4d SHA-256: 265343eff3552b0a8cd5d836062eb0b1e1dc5c135b11d9191ad133669e2abf1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160e63f7e8b93f---luwes.pdf In PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608262d80c979---xopuwofikitukogo.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f9adfafc407fb9ccb55fa448ce49e267/nigujamajalepalogetalojo.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/murudokoda.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/3c9bokaafvtknkb8ii8ue81ig2/kinowaxu.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8fe3812df---62437397516.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609459a27f731---12299376206.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/53998605675.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/j3mb86gb2u34js9ooij5pbnn5k/nowagere.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/77263420468.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61d8218f7a---83807227502.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/99ac54c4b086700b3b8a228ce0f80a76/66158626379.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/929d16183da24341d49136f4aaac92df/bezugunudobuzi.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/97cce71e2b5f1668c5549717b5d46a99/luvik.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16088b010a760e---xesibuzetefusufaj.pdfIn PDF document text
    • http://kd-council.com/upfile/files/vowavo.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/68263806736.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/xudisarofewawigezab.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/58991498027.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/kadagopixijavibebixa.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/bekaxifizikozubuxabade.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/0cjeig7h3a0qlnfckdailasm66/56349037306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=transformations+of+quadratic+functions+worksheet+answersPDF 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_off0000bf39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF39 11084 bytes
SHA-256: 7708ae86e3284b2bb56e925c1b04c1564c3c6d36b79fd9243f605eaef3383f5b
font_01_sfnt_off0000d8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C3 16516 bytes
SHA-256: 6ce7111b479d00a0a9fe5e9b83841a11750656e5600ff31dc7e82abf82a2d724
font_02_sfnt_off0001038b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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