Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c363281c468d50…

MALICIOUS

PDF

83.6 KB Created: 2021-09-12 12:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d1332587a155397a6fe8bd0c1ed24c27 SHA-1: 015fbe382fb25da6387870cab0ad8b4a0d817dce SHA-256: 15c363281c468d507a181a35eb97325e9fd94c7f09bc2cd82a8fa72eb3578f62
176 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. Several heuristics indicate these links are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://bridgeonlaw.com/filespath/files/20210910072434.pdf In PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/jonifak.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/teletaligalutife.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/zigasilukubijus.pdfIn PDF document text
    • http://lex.tj/img/file/jixofobenofojazobe.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/65042854624.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/683450256.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/0a57fdab5bfe85378e6679f0452c5727/kerisolasefebomus.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/pawos.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/12245623153.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-4/20210904213153755064.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/64720824815.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/wudojad.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/kemizapakozijoligezabi.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/45244999467.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/34973283032.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376f11a6aa4---15737582749.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/gipekonivapomijamawokadij.pdfIn PDF document text
    • http://cartopack.com/Images/file/45030471320.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/60645236025.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/76424490388.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/81833346381.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/53326302072.pdfPDF link annotation
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/24e7099568cd658a3ace4782d7f146c4/78646220814.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/23782762757.pdfIn PDF document text
    • https://ms1oke.com/contents/files/daxoxogubuseda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=streaming+full+housePDF 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_off0000e09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09F 18304 bytes
SHA-256: 577cb7cdb73b848fe11a5c86705a271abef63bbb41141076b878a23876c2d2e0
font_01_sfnt_off00010feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12802 10836 bytes
SHA-256: dfa0ac5382a041c464378af55e963f1a52e772c87540026ed90bb064c800ef8b