Malicious PDF — malware analysis report

Static analysis result for SHA-256 0348909613520aa7…

MALICIOUS

PDF

90.1 KB Created: 2021-08-03 22:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1cdb3040ccdb30759edd2155fe7d7891 SHA-1: e1faa5762659e689c079638a35279a39290b83ee SHA-256: 0348909613520aa7f7d2450941452671f05e3ac5d72ca960e8271dc022dab3b5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting. The primary purpose appears to be redirecting users to malicious content, potentially for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://smidgel.ru/uplcv?utm_term=que+es+una+oracion+simple+5+ejemplos PDF link annotation
    • http://ladue69.com/clients/876446/File/rolelerivujidex.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/48747119222.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/2oh3rplqj1c9le5c69ugdb9utj/50641805441.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0558278001626655391.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/bifexazufexerivexuvef.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d88a3d948fe6d481d249011d99b5f93b/79807110084.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607839351fce4---garemomanexelawi.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/4ba982cdaeb39958c702abb30da1973f/58735424753.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/5rq9njvt2272d94j3ufcgcc4u8/82933292694.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/gexopoladaxuredipuvulam.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/127580177360ff58eb2d0a9.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/busubasiwezowageforaxumok.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/gukanetofodaletekamasuzu.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/vafuvojubemiwarunir.pdfIn PDF document text
    • http://velisend.ru/photos/file/rodadurimoziziriloz.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/nukimijabipu.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/zejegovavomepaxuv.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/83958773225.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc88f0c3c9---81537571420.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073053a7e49c---duwegukimenuz.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/dizevulip.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb3768c548---68409364350.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_off0000fa48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA48 10860 bytes
SHA-256: b078df35f90e73749198710b96ab7804d6649116d871da4a98baef63a7614763
font_01_sfnt_off00011369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11369 18340 bytes
SHA-256: 738e453166dcefc1a339c67a9d3599a80890313db8552d2b2df97a71c74685b5
font_02_sfnt_off000141c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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