Malicious PDF — malware analysis report

Static analysis result for SHA-256 87666739fc977d68…

MALICIOUS

PDF

206.3 KB Created: 2021-08-12 07:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3f4c8e5139e6b9988175db6744e4dc8b SHA-1: e45aa4ff87f8034f36d79f354b009a3d273cbfcb SHA-256: 87666739fc977d6836714064efccdbb92e3d941c8d63192c5b4abe1585e935f6
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting it's designed to lure users to malicious sites. The presence of multiple external URIs and a compromised CMS upload link farm strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 5

  • 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.
  • 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://consultingexpert.eu/fckeditor/userfiles/file/23467524364.pdf In PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c5d83b243---58408790334.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ecf3d37f0cd18cf9bc4614054ca6cf23/62500277328.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/gawokaj.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fdc5783cb---zomodedewelopufawijiwunu.pdfIn PDF document text
    • http://doer-sh.com/Uploadfiles/files/sewinimamajeremafavub.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/wesaruxodetariwuwupe.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fbf721f09---67762118987.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/jadolufumonatabik.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/tiduviloxonekal.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/10356577219.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021051900503549.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8551340253be7b4583bdaa1405b9c0f0/24327610193.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/47457890445.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e8df78e3b---88135343289.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/raxizelatobobalazanale.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/8f65f7d705d0c7839b90daa3f8d79c28/87373885638.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/50510858772.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/67518283504.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0d4dde621---84288035275.pdfIn PDF document text
    • http://sb-78.ru/files/file/22217598541.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/1163589451.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/rifudogikibojuzes.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607e257c90456---kogavejijuwavowibod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ammonium+acetate+buffer+ph+calculatorPDF 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_off0002c214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002da26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DA26 20880 bytes
SHA-256: ac3992f92f5e80aca522aadd39938cdf807d95ef011e4f22a4894010d15688cb
font_02_sfnt_off000310f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x310F2 10800 bytes
SHA-256: de765887aacfaa69b3b880951a45fb7b2c260372789bcdf0475afd850c4ff0cd