Malicious PDF — malware analysis report

Static analysis result for SHA-256 985e29b7daf4b55d…

MALICIOUS

PDF

69.2 KB Created: 2021-10-12 18:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c78a490f7f6652ea7d2ecc66e901e573 SHA-1: 303307ac7e079f82aa9e5804ea3fb99c6105e640 SHA-256: 985e29b7daf4b55d9a338b606f2f7fec98ca3d86d6f52fa7cc0d7936f48be807
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/vol6hjsmol1o5m5qrilslk7vlc/tatoxidemolenufib.pdf In PDF document text
    • https://vandolderskb.com/images/usr/ribixebemovatopozuzat.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/51118851794.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/zopagebix.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/nederegadimajo.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/lexefik.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/wefun.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9868000577.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/exizoto.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130df365ae47---zanapitogijasus.pdfIn PDF document text
    • http://iltorg.ru/upload/file/23383365585.pdfIn PDF document text
    • http://klemanpince.hu/files/file/76747225601.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/37292493068.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/69683989236.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/rebukiliniguz.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/43046585051.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c20fe281ee---11975505669.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/xipidibek.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/56715504692.pdfIn PDF document text
    • http://jiab.net/userData/board/file/18137924438.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/71676094768.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/xewokejoxuvotiw.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/kuwizebulepu.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/Z3ufxtS7Wvw/uplcv?utm_term=ece+gate+material+free+downloadPDF 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_off0000afde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F5 10720 bytes
SHA-256: 3138edb737cdaa21f48452706bd72ba7ed93c78f5b4734e18b8d06df927b85f9
font_02_sfnt_off0000e05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05D 15472 bytes
SHA-256: 333475a1347dc57ecc6221bb48b80f602d8e646b379bad0d0dec9a39f1869865