Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e77616b1b2c390d…

MALICIOUS

PDF

73.5 KB Created: 2021-09-16 21:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 83cf0971a23dbd13e4b351decb9e1f73 SHA-1: 0e42147224f827dc89817572cd6021283c4c2ec9 SHA-256: 2e77616b1b2c390de5d023c685e2627fa18b4b0c20fa76375f59462eb2f81db5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely to lure users to phishing or malware distribution sites. The presence of external URI links and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pixomot.ru/uplcv?utm_term=cara+membuat+laptop+menjadi+android PDF link annotation
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f466344c74---27720855027.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/riwutotipoxitirorive.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/f38318ba41b9a006558736b35bde0b0e/rosebutonezalod.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/43880358174.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/jikatenolanuka.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9538c0388---zoworajiwirowefer.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/96222966205.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/wotajifof.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/tanizipexevezepumepu.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/p9bqvhek0d39drdk87atl7l67k/vifuduwitusebupitexe.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/misozobabugavaxadulevime.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/14318545274.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/logilak.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/184e3055c8a083a603dd8c07a31aa2a1/puzosovotavepamibeti.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/misisovagubutibaponu.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/33461373981.pdfIn PDF document text
    • https://bdata.vn/upload/files/govolaxuliwunili.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139842f6ea90---5533492558.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/50588686058.pdfIn PDF document text
    • http://marketingnews.fr/images/file/49588739448.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///47128752097.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/memoluzima.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_off0000bd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3C 16280 bytes
SHA-256: 73f2cf8399754292c6245b0d095d2aab7b09b7cf2952e547ccc76e14c736ce64
font_01_sfnt_off0000e7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AC 10784 bytes
SHA-256: 8463a592667b42190ce52b1515fc17fa5b638ec6059b068a2f58c8bb5ed156a7
font_02_sfnt_off00010030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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