Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9c17940f4732fe…

MALICIOUS

PDF

78.1 KB Created: 2021-08-01 04:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d9f9ab899cb4f2a0c0577f928bf853e1 SHA-1: 6417055016a9e1c4b2cb6a328e895fa6195e1f55 SHA-256: 8d9c17940f4732fefb82a24b9e78e9b3e8eb0817511c871da8cd9943c5f2447e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites, including one hosted on a WordPress upload directory. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ca0f9ab22---rogumonukez.pdf In PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/mejekobenilivadodivoke.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/zenutimejaduditapifonibil.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/5985b49cde08e291fa7a5ef39617eb7c/zozamarikopu.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/1e001fd2344df8a4dbc4aff2644ac3c2/napimewedamapufifif.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/14465778582.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/85456329537.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607673ae0f53b---4415217358.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a29f64c394e---72780276330.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/netixafowazigi.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/sj411rq54h1cvgv3vhtaj26l26/tolire.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bf2679c1e---63919640496.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/vobajipavegijot.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083f2a9877ad---naxalidiguvutogon.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/42842824353.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3921b6b2f6---23451382468.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/64631794830.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/lazijenogozava.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/9ev3f7gddlda0p1auosb53nt04/88221623444.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708481e65bf---gerakezebixitotex.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/pk5p23stsjrrgpshq75he04oh4/74076723311.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/posemeforofama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=light+oak+china+cabinetPDF 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_off0000cf65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77C 10384 bytes
SHA-256: 80d8cfebd7da99ec7618a6c6b926cbac3ed74327ce40f95cf883ea198403e907
font_02_sfnt_off0000feec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 16860 bytes
SHA-256: ebade44afb7d0bac41c7d8c4d5f4effa24043983d8f2ea2586085a9bdcfafeb4

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