Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfea462f7ab64542…

MALICIOUS

PDF

77.9 KB Created: 2021-09-23 20:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6e2db734b6029f5b2babb5fc477eb910 SHA-1: bf8bfd1b9f4913d7940c1c8758f9e48a390f3e7d SHA-256: dfea462f7ab645424d2b33d0297d7bd798b2d44b07516019b767efbb253372c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to compromised WordPress uploads and disposable hosting, likely to distribute further malicious content. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://yoron.net/up/files/sazegutelemifeziven.pdf In PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/dodimalutubivuvam.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1631707278.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/tajobaf.pdfIn PDF document text
    • https://camelcarpet.org/d/files/kusofimiwo.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/80203333336.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68588063842.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/xusutimubajimoziviw.pdfIn PDF document text
    • https://podimercrm.com/img/files/berirobufu.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/xurexirosuxosajobudisiv.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/11221033023.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a98ada91eeb370b3e03f626c0ebc6b9e/37388706214.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b21e543ff6---kekug.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/nujuniroriv.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/duzobid.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/zumakobopuzelanegadevi.pdfIn PDF document text
    • http://montesantangelo.it/files/files/xosexifepufijadu.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021092021053268.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139db600498f---63711030252.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/13f2bo3okrkukvi43fbi1g59gn/11620481178.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161478812dbdcc---gebuve.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/10925772293.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/41591835993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=365+portal+office+loginPDF 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_off0000cb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE387 17680 bytes
SHA-256: de6e585165718cb01662925a16fc7f36336b525019bd266f0c538767790de5b5
font_02_sfnt_off00011178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 10864 bytes
SHA-256: 108216b29b190b1696586d4d27a37ecdc3ce3bd850902bd3015f18720a710c00

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