Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c76f80fd5f95b76…

MALICIOUS

PDF

90.1 KB Created: 2021-07-22 09:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d8f37efc427dff932ce06c9d67646229 SHA-1: f542f41cd354c7b4a846d1c57ec75169e279d6c6 SHA-256: 7c76f80fd5f95b7665952636acdfbb171d5799126bfe27d490f14475c10ab69a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites, likely to distribute further malicious content or phishing pages. The embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://mail-ex.net/userfiles/file/93478645934.pdf In PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c78dd87ef68---70196951118.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cb228e335d2---67565913562.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/4619126944.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/mugume.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a5261571143---97922471304.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/0il49b8vo804h0m1qtank3du64/77001827646.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/vitidobelikab.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/46338133134.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/52219636712.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210701225139.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c325df81b41---modunofudaxejomuxek.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/80614485282.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/sasetewubuweziwadev.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/45640085130.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210616020204147.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/vn978actmdqvvu2s2oar9vnku0/jawosawoxuvuduzen.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077411d8eb73---gijodesepogoseros.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc94e60927---ditekivefo.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/damagimozetibuz.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/kapefakudavokekaxixakoruk.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/b7633bf02ecdcefec5d22c9ada33eca0/vasefak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=dark+patches+on+foreheadPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/86366895558.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_off0000fd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4C 17084 bytes
SHA-256: fc1833745f3f8149f92cc835fc298cff8befd233784ad5e2797b319f186f513a
font_01_sfnt_off000129c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DB 10672 bytes
SHA-256: 0479658457429e5f31f6568a11dec49bcdc38bd0706aa352be81f62ce543ae11

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