Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e13ad3e23661c4…

MALICIOUS

PDF

88.7 KB Created: 2021-08-12 13:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9b0ed627be4aa88db58d894df766b24c SHA-1: 2695699f15022767a9bf280ddfa25f27a76410ac SHA-256: f8e13ad3e23661c45d7d9430bf752f97c61a124409728706b2b27ca6b0bc8eb0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cb5370580---6342117442.pdf In PDF document text
    • http://vom-ragnaroek.de/uploads/file/77249519497.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/30fc21e1162437a67d882fa6a3371f0c/14430876397.pdfIn PDF document text
    • https://hoongnau.com/upload/files/pilotawexakaputexid.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/884134dc4350693730012f3bf09adf0d/9481738562.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/45705546114.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074939682ca2---89189506305.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/44556836299.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/23197941007.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/zomeje.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bee82676b59---nowimegutunegexi.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610c1575e605f---mixexebo.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/59111622736.pdfIn PDF document text
    • http://yuli-china.ru/d/files/74729670710.pdfIn PDF document text
    • http://mindatpeace.us/uploads/files/xegizole.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cdebf3c7fdc---zisiladosu.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/43024564350.pdfIn PDF document text
    • https://linardi.ru/files/file/noritavafisokimow.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161143344ea9fe---modedekeluwotomelu.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/sapepitujafolavavavixopiv.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/jafamixurakuzovivole.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707cf841690---dojizejiwir.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/tawafalu.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5105514b9---mixamokabifekoduzedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=comment+t%C3%A9l%C3%A9charger+des+livres+fran%C3%A7ais+gratuitement+en+pdfPDF 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_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 18904 bytes
SHA-256: 9960c66e8f301e3a608495c9153b2f0d4180109db0b735054d5704c85f0cb3ec
font_01_sfnt_off00011eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13706 11616 bytes
SHA-256: 6212fa266e84cd8b69abdeff88a0a445c4b5aa5607240012466b5d40db384a44