Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5929cdc0a9659d7…

MALICIOUS

PDF

90.7 KB Created: 2021-09-14 03:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 38ff045192e411f708b991ae7565b968 SHA-1: 2eecc84ffa6504febf13dd34ab551154529cfdc3 SHA-256: e5929cdc0a9659d706e48efa0b7435114d1fefc49d1905b9069fefdad0ad2b76
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics points towards an attempt to redirect the user to malicious content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://anninh247.info/upload/files/wevebixawiwatesu.pdf In PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4edebcadf---35542718172.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/65928059053.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/kaxakotoriwadegezolewib.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/tezomamobafutudenobim.pdfIn PDF document text
    • http://e-menu.hu/editor_up/ligipavaxogigujesaz.pdfIn PDF document text
    • http://clerus.hu/files/file/21433912282.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/puxavirolalitiromelam.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/bowakawodokejewubaroreper.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/59521421132.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613eca39619a5---58122080958.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/92917187193.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/lixuwava.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/dafodetagabu.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/55329094113.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/siridumejaturimezif.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/29cc79df09da0ad9a62e8bbaec4ac4d3/87528413459.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/faludovazafosurem.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b12d2d1c1---42575138630.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/sapovokefuwakigazezowa.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/61191526488.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/161328b277e8eb---86375418404.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134cce758dde---sorifezasevamivunere.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/mozal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=hill+climb+hacking+mod+apkPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/pitajewi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011108.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11108 18224 bytes
SHA-256: 6d69ea9bf8aa0eb80339800658b4e20c5d1f398d386bb86906749210806d6ff7
font_00_sfnt_off0000e1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EB 18076 bytes
SHA-256: d2d2a90f548dd7befbf13dfc55d3e3666868c643650cc0fba50012c6963f2eb4
font_02_sfnt_off00012d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14570 10688 bytes
SHA-256: 43343ecdd37f32fe4c9384539e95eb3e7ca21eec390958356681b019832ccdd1

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