Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e403010b04a9ee7…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 01:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b302c54520912f08422cb8e10381851b SHA-1: c2a740f6bfcb6ac6042cbafcfef82731b819e690 SHA-256: 6e403010b04a9ee7006fe343dcc107be4599b4b3b731401776e89ff513f5c96d
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The primary attack pattern involves exploiting user trust through a malicious document, likely leading to credential theft or further malware infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://alakharia.com/public_html/userfiles/file/28961817699.pdf In PDF document text
    • https://vandolderskb.com/images/usr/gukotugazojodazaridabur.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/83282813694.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/84893912523.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/9i2dts7mcjgvd6pr8mkiihq4c9/95028442676.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9e3e94fac90154a0bee9a783e7d2ac0d/43993172251.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/37148463235.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d234b45b2a---bekem.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/zupufejaran.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7db2d3237e77ac251b199eecc426266e/doterob.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e9d756b95---zekiripuzeraluge.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/nowesevapinadomomi.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/pukowelegakirajopusolane.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/palajuvivow.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/wegisemibuzipotirajisojan.pdfIn PDF document text
    • http://faradbox.pl/files/file/tiwesexofupuma.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/12298976369.pdfIn PDF document text
    • https://wagaskar.com/media/70722848634.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202191101124656.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609880389cc1c---povotebasojogefurivunixa.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/gpm7gi5tc2r7bvn27gkfe7boc8/zakujetinetisudekuvedew.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/vemexagupazedut.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/zawopabukozijerefixunugi.pdfIn PDF document text
    • http://www.celso.org/download/86395872525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=24+cm+equals+inchesPDF 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_off0000e059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF870 10524 bytes
SHA-256: 12efdd08451c5e1144ce1d114c13b9e812fbc08cc155929d5ba2dd34f268dcd7
font_02_sfnt_off0001102c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102C 17988 bytes
SHA-256: 232fbf6cfb1bb3549dff9f8646c4d4a56cd4b0535752eff784b92a2231205277