Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa65845c0311d6e…

MALICIOUS

PDF

100.6 KB Created: 2021-06-30 04:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2d2a9a6fd7136aae321763d6c56a0b2c SHA-1: 4cde00630a21098b77309bf5eb2b5b0d75e849f2 SHA-256: aaa65845c0311d6eb890baeb08ebf8159c36561fd141885c1e8325acee93848c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further malicious content or engage in phishing. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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://sport-jicin.cz/dokumenty/gepipiko.pdf In PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac340b869cb---gadodajiwimugofor.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/konubur.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/7vgoq9rk9lkolq15866ns0dno1/remimulafipelekelaki.pdfIn PDF document text
    • http://7onseventh.org/clients/868256/File/3130776714.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080141967df9---19310608794.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/59020209950.pdfIn PDF document text
    • https://lesura.net/userfiles/file/6236370854.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f387d82d6b---45288213520.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/57884267672.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/4a729bdcec5215ef374e1709803ce284/xagakuredi.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160853acb44b85---sivujepigebinusinuvux.pdfIn PDF document text
    • http://emurus.jp/userfiles/file/91232111651.pdfIn PDF document text
    • https://namlongadc.vn/uploads/news/files/pawane.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-9/20210509120421772064.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/fokiligokasolevured.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/814aebb9aa932bafc50259dd14664a85/xabim.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608af6c2e4a39---79618504766.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/456b0527a0a0b198e2192f9fa3f0ef80/luropabajidajozu.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/ddd5e1ecc63dfa6f460f0b92a2299547/39396100626.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae362238bf---9569081414.pdfIn PDF document text
    • http://sns.hu/_user/file/1540755399.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/18086544470.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086847c2bdd4---60165376073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=tabernacle+in+new+testamentPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10430 17892 bytes
SHA-256: 33d2f4d04d15669e353b2ee61ee12f4e8ee1dcadb3fa94170f3c59b95017ab40
font_01_sfnt_off0001201d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13834 10460 bytes
SHA-256: d4eeda8fd684f236c83b48e8e435096630553bf63294248f22ca2536abeb2312
font_03_sfnt_off00014ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FFB 20620 bytes
SHA-256: f188b7dc82c708eb65a955a63464c90991e6a06627f6f13f9d8064b7de76e64a