Malicious PDF — malware analysis report

Static analysis result for SHA-256 86321d6cde4dc2d8…

MALICIOUS

PDF

79.1 KB Created: 2021-09-08 11:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7e0d0541cef3630bcac93becc31a50c SHA-1: 7e0d461ca08e2baeae9a9fb0abe1e10ad8e41b0a SHA-256: 86321d6cde4dc2d8f97852c0b3e4b48a10be3650687b9a3c3a3340fa54610ceb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage, suggesting an attempt to redirect users to malicious content or downloads. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://geometracosentino.com/userfiles/files/muxag.pdf In PDF document text
    • http://baodieptailor.com/uploads/2021-08-24/images/files/tonowugurex.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/sovujelo.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/t1kh9vfdosq0rm205knucp925b/koguv.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160718db817b9c---53663739545.pdfIn PDF document text
    • http://ktcz.eu/files/files/bogemixigekibag.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/56736382108.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/61206d8416b73b300046031e09c39d7d/pudoko.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a15ce3cbdb---43397268252.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a17f1987d86---gazuretifowanire.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/timosenasi.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac32f8a083---36724676606.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/4jj3p43b9kp2vdfcrfi3pvihqs/zugurofulemavuresedobo.pdfIn PDF document text
    • https://laps.pl/userfiles/file/80222891191.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/37605497730.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/vefutokiru.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/guzine.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/93260424930.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161354a8b3ebad---kofefibopizafija.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/gojevik.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/a3a84584a11e8d1f18189a886901f254/18514283116.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/bomofuveropanuwobatemaxu.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/72050187856.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c20f74d8d---75609541976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=alexander%27s+empire+worksheet+answersPDF 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_off0000d049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE860 10952 bytes
SHA-256: 3518ecbdae860dda30c8462a699212801212abd4934a4fe8d67a5b585f47a232
font_02_sfnt_off0001019e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019E 17560 bytes
SHA-256: 7bd3c137c7c844f08b74af92a45a89dea670ebc4cad12589a8590f03b1214d51

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