Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc28161aca37dd3d…

MALICIOUS

PDF

90.6 KB Created: 2021-07-17 00:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ea9f55b411e5ce9bb428e1fe4025cf69 SHA-1: 12164298b247e596ad70eaf93c6bdea44fee7eda SHA-256: fc28161aca37dd3d21caec146f2b4d205e6236197b0635749d1c8894ae507d2b
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to lure users to malicious content. No scripts were extracted, and the document body was unreadable, but the overall structure and URL analysis strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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 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://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d539487ad---zuxibikafiwupasizafapuvi.pdf In PDF document text
    • https://gites-les-bardots.com/userfiles/file/naleba.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/zajuderudubixemoniniz.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f15f23e1eed---44642933136.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/vevek.pdfIn PDF document text
    • http://614move.com/clients/4890/File/7963702227.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a7750f81b---magonijutexekawomomipanuz.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607352bd9dbeb---59055404389.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/vedesemogejasatelujuru.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/21662681090.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-13/20210513105539539441.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/14173748908.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/79298176618.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608205105a411---roponolitilameta.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e8f412011---remuni.pdfIn PDF document text
    • http://cartopack.com/Images/file/jogexipurazazudidugumiror.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/waranesi.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/8293154811.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54413590b2---bemutenoxenipomaluvowevif.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c887059bdaa---sokegabizokuwozukozuserus.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/27163164744.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/b11afc16a760575b003d3b73b6188179/9057950135.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3977cd4545fb2c004dca140d76db98d3/supemixunolibegoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=icd+10+code+for+tirednessPDF 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_off0000fe04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11616 17996 bytes
SHA-256: 32a0beda80146ca2e031020fe43c49a426b07ce15e5cbca15b1c6e4b8242b818
font_02_sfnt_off0001458e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458E 10384 bytes
SHA-256: 9467bbbdaaea782680835bd2dbdf7034f77d0d486789b37e5cacf19d3e37d533

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