Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ffa3e3423e78ef…

MALICIOUS

PDF

76.1 KB Created: 2021-09-19 06:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6636095f0d5bf40e4b30a8a6e3a37f59 SHA-1: 58b513b4de74a3fc65a33d2025a6ba4ce717794e SHA-256: 15ffa3e3423e78ef32095c2c3a9153b01baa00713d248dbae2da204c174ea198
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised websites and link farms, suggesting an attempt to redirect users to malicious content or downloads. The presence of a 'download button' heuristic further supports the phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tandartsindex.nl/images/uploads/81822859457.pdf In PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/1936966198.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/bidowanakunirixorixad.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138434e2bc21---zowinonewawerarepe.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/vugan.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/sapubuvomibokawura.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c8daca4dfacef3795bfbadb02c0502d3/38691903865.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/14643970434.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/31793359763.pdfIn PDF document text
    • https://mfdesign.hu/files/file/64046725184.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/lemefilag.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140247b38bf7---xasifarumegigin.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/63231831709.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/22207573225.pdfIn PDF document text
    • http://xfswchem.com/upload/files/53705416947.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/sixewid.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/99ba459ff7ba76c2711880fc0e7292f1/zuzezowo.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/vabotuwow.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/17960229780.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/bcefa29d869c66aa4eaf0bc3f6400b94/wedokipivuwimebuvakozijav.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/tuvobajufefi.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/dozava.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/fibojo.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/47716986456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=now+united+songs+download+mp4PDF 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_off0000c009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD820 10876 bytes
SHA-256: 3d46cc1ac67882f50e47d5efe9a330d5bb6079cbc8053bdf23079701388b10e6
font_02_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 19260 bytes
SHA-256: 1333369c40d71dfdeb6ecaaf0fbf126916325962de7edbdb13b1af767f20c5ba