Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff84e8e9155f4dcf…

MALICIOUS

PDF

81.2 KB Created: 2021-10-21 13:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 060adb018b5e68c69e39418eb0a6922e SHA-1: fbb07126d90a997c869edd303c9bb3e7c127c5ed SHA-256: ff84e8e9155f4dcff1355bab67687b78b78a816393d9a37de8104ffd183e7162
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content. While no scripts were explicitly extracted, the nature of the links and the detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16164a8c8e675a---tukenoni.pdf In PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16162955477905---geropezugufakuvawewowi.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/92931987834.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/mijodumusafowobusugaxu.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/14116260604.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/jidaledabip.pdfIn PDF document text
    • http://muaklekcoop.com/downloadfile/File/runidevag.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/dumiv.pdfIn PDF document text
    • http://indah-education.nl/userfiles/file/woterelarojakomotaw.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/61827192186.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1615b7e4429688---segisipokukukivime.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1616a206db9abd---kedotedebusatitimupo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161598e3052dae---tigusoxof.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/180320121812.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/senoni.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/sijadisumixogof.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/90580291769.pdfIn PDF document text
    • http://zeci.nl/im/image/tewogonumudozazilimaseti.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/fovuwidurulujepulakuwube.pdfIn PDF document text
    • http://mathahospital.org/userfiles/file/dewugewurumisozunevuzu.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/gafomavezawiremovaketixir.pdfIn PDF document text
    • http://weingut-suppan.at/files/39652729626.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/wifalipus.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16137f066586bb---62294667254.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20211014/16341644521636.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/KGDyd8lM0uI/uplcv?utm_term=how+to+check+who+viewed+your+profile+on+instagramPDF 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_off0000d705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD705 11516 bytes
SHA-256: c195ff0b413a0d8a2281214cdf73e4b6d73bda840951784cc26547bf9f595018
font_01_sfnt_off0000f1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 17328 bytes
SHA-256: 3f72b8e68c49320d82e0f1ee8d4e1d4ca539f16b03e1b6169f41fd2d521b78f4
font_02_sfnt_off00011ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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