Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2ebbd54faef288…

MALICIOUS

PDF

77.9 KB Created: 2021-09-14 07:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4857646a40814dc980adf05026fc4679 SHA-1: 355ccccefc8f30c2fa4c9cf6fbdc4fe7cba75124 SHA-256: 7d2ebbd54faef28808b3ba088f74c4c78830b22ce5210896a7a00d4a074e9f27
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links, several of which point to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161353088c2a9f---27580741225.pdf In PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/9740567197.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/mufabinubiloxifaxurex.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/vofid.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/jj2d38m83mlar8a3p1vso7ck64/xapurabefobezilepin.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109122337053639.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/76972330683.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210911_070313.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/nilupabeki.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/towutozefewaw.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109140258569256.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210912094621.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/xetalipipifijadep.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/60903468236.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/lozawagekiluda.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/sebovoz.pdfIn PDF document text
    • http://teplospectr.ru/images/files/16844914932.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161387b09afced---78854173657.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/8783033731.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/53310859525.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/58375939125.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/51737017135.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137237cd41bb---16733499557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=android+11+on+pixel+3PDF 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_off0000cdac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAC 17560 bytes
SHA-256: 749af62dc87c23b97db2d75fa1d7e870716ae548403ac37a7493c3956528b875
font_01_sfnt_off0000fb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB37 10264 bytes
SHA-256: 07da0cbcac0f6eeb6d23730b4ff2436014e22b5e173844b3c34953e8ade9d884
font_02_sfnt_off00011263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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