Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c59f972282350de…

MALICIOUS

PDF

77.0 KB Created: 2021-09-17 21:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d10443a9c3874b7fd4a7cc0605fc1bc7 SHA-1: f9ebdf3462378b1425fbf96804fc06a6b4bc4d76 SHA-256: 3c59f972282350de6c92d87ef315ad09f02adeba63d285d24a454ba74ae7abb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://queure.ru/uplcv?utm_term=pokemon+ds+rom+download PDF link annotation
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b390716e547580fabd0f2f0f063186a/99914454991.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/jameruzegak.pdfIn PDF document text
    • https://subded.org/userfiles/file/jewevijufasadexu.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/7a1ae5a00b14d70a72b3b655523bf1d6/zalarodesevitekefamiwej.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/93622956368.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/zonisonanamas.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/nirifumuxufidumegaper.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/51023ff9b3de3595bcc15de6822d7850/fesexazisalu.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/16575523084.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da2cda79da---53231979299.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/watajodetix.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/xidafupub.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/tojusipawag.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/5517084769.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/56317455655.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210902_A64B72BCD7133719.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/24696407639.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/88316589440.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367e0f0b3fe---75514994387.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/26458564279.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/24369914511.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/dixotoniwejilutuxusubavot.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/10278991225.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/semexefepisusodosedal.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/58440049293.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/kosig.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/zogomozajigowadijipiniki.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/24398928350.pdfIn PDF document text
    • 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_off0000c977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC977 10400 bytes
SHA-256: 10fc72e0693bf718f0eacdf6f67ca194d72c949144008fbcbb5069a43ce6dd4d
font_01_sfnt_off0000e112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE112 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF924 17312 bytes
SHA-256: 9bcf55dc3f23cc7f29026338cba6a6f919459334d25e90772ae23fd8e39d463a