Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8104315700c1a2…

MALICIOUS

PDF

88.0 KB Created: 2021-08-02 22:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: bd1d91beedaa12f1d48b1979fd6ff15c SHA-1: 445933a62b4d05997d16c6dd6b94ea1dc8ede358 SHA-256: 6d8104315700c1a2d267121ec830765530a7506ca9c952f4dea240457d479c09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://dolmalatrek.com/userfiles/file/4842134400.pdf In PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/15d89bc02196e27935a58e72115d45c5/namexon.pdfIn PDF document text
    • http://greenbrier101.com/userimages/32970202629.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/rudok.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f7563be4eef---bafelojisudamewoz.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63d410da18---65932512568.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/fegekojunezagodu.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889b24e77bb---51846231973.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/jazubuxoritobogutovoneni.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/903730e16f8f7c123136a31b73fe6358/91365021633.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/86806476803.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/79082782585.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052623025892.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/kuvulojupuruvetenojolo.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ilmetkpclemo02i9soq8k34rs2/24243157543.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608589f472f24---sotixufubib.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/81296428991.pdfIn PDF document text
    • https://artbynela.com/uploads/file/11024860277.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/85246097961.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/abfde241bd502ff10f515207e8b729bb/fipekikepul.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/7e174293606e9b23c748ea1abb5b995c/32007933279.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/89910241849.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/3b0g8s4hs1h6oo4s8e11se27vd/10997553962.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebbce5f667---xujiwojexokigorarapepovi.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/2b674381cb947274b5eeaca39dd53ff1/50846627410.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608769bd01810---32902306603.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bf809d265---70769714990.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/178bbe27df9ecd69a9332d50f48ffdf8/gelonavepunisosapakeroru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=bodmas+questions+for+class+6+with+answers+pdfPDF 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_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 18008 bytes
SHA-256: d6db7ba73d36f040f98c84fac17c5e3935979bb93d3d59deaa4b422e74c2c203
font_01_sfnt_off00011f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1B 11440 bytes
SHA-256: 42d90764643448f97eb86f87b57dda3b28af578ac60db00386f0fbd59c6b7910
font_02_sfnt_off000139d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1