Malicious PDF — malware analysis report

Static analysis result for SHA-256 b324220f98218376…

MALICIOUS

PDF

88.3 KB Created: 2021-08-13 05:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d0ef3b18ff0aa333e6f97a5a9780c68 SHA-1: 1846f37489fd84d7013e9443fd638930cd1f4264 SHA-256: b324220f98218376f96d0347fc8a865c354bb2422c7a6e4c1628355054a16d7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, but the presence of external links and the high detection scores indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/0c84c5a72f9efcd074f524258909a456/kafavelimufidisujo.pdf In PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d23ecc51c5---96961047953.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105130157.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/vomipobavo.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/bca6b03558ad7d365949457d96055c3b/7295159551.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e85af2deb14---raresumiwekisivoj.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/97031536202.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/gujaxuminuzi.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/zagapurobepamulizix.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6c683d916f482265f5fdfb45fe3ef608/netofimil.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/38241089554.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c06cd722f---80729888690.pdfIn PDF document text
    • http://stromzeleny.cz/file/rojuzesexupuv.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608729548a6eb---10225535973.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd622d0b534---9774951704.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/zexarir.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607714c2230e5---27195087699.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/52947953719.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/43080666107.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/vupomarigelakew.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/lotofirorovabizezat.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210701190357.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/voxijironebigepiwodudat.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/75566306937.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/lthq5641hnls5fuiidhlabb1h5/wotesuwotopur.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/31962465833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=egg+production+business+plan+sample+pdfPDF 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_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 17064 bytes
SHA-256: 006bd0071ec6939f98dda2103b27fa3e864b474c34de86600f056fbd13fe74fd
font_01_sfnt_off00012156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001396d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396D 11188 bytes
SHA-256: 2cf3491a873807a6ded68af3951b7a543e192df80e291575a9321738eb28719e

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