Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59eba087f5d6662…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 12:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf83c08aee2db86e0a825c1272a1b393 SHA-1: fd6ca46550e4f4b81a59d5cfa7b56dba157fb102 SHA-256: d59eba087f5d666289cc411009a97624fb76ba0dc3f896eaf8e300cdd5566636
172 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of urgency lures and download buttons suggests a phishing or social engineering attempt to trick the user into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://winterwonderlandzundert.nl/uploadimages/files/82770056144.pdf
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/37120369540.pdf
    • http://slsnn.ru/content/file/84547863292.pdf
    • https://bfull.ru/uploads/files/48585898227.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1ee441c8f---73222096421.pdf
    • https://patriciobanados.cl/upload/file/
    • http://www.findvoters.com/userfiles/file/66228796983.pdf
    • https://badrivishal.com/media/dulefawiseje.pdf
    • https://98ing.com/upload/ck/files/20210908_221031.pdf
    • http://www.mariabeckmann.com/fotos/uploads/files/raber.pdf
    • http://terremeraude.com/userfiles/file/fezujamofejiwatoxeteboz.pdf
    • https://fivetc.vn/uploads/files/18748243901.pdf
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84101508133.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/5e816a401261bd4c375d07765f058679/sodefuvore.pdf
    • https://lapalettedesarts.fr/gestion/file/84898824064.pdf
    • http://jiin-torng.com/uploadfiles/20210907091012.pdf
    • http://sineadstone.com/userfiles/file/rosazifurefilexedanadobug.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ec687332eb5a828a6bf3543f307fe9ef/679422154.pdf
    • http://preiss.at/upload_files/files/4089002955.pdf
    • https://lekkermooi.nl/userfiles/file/nuvibon.pdf
    • http://safaraval.com/basefile/safaravalcom/files/lupenisofebesup.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613230a3c5362---15632772772.pdf
    • http://airfa.it/userfiles/file/93896017507.pdf
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/89027367455.pdf
    • http://makinsushi.com/uploads/files/rokeloluni.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138923201571---zonebe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=instagram+followers+and+unfollowers+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d93c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD93C 16792 bytes
font_01_sfnt_off0000f14e.bin
5ef2e3303479696d223a939b79da1121474f38ef33dc5b06c157edc9d227853a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 18612 bytes
font_02_sfnt_off000121ed.bin
8f45aa859f877bb8c44e7dbf701854099a68831f2389ab4ed562bf619bdc03d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x121ED 10976 bytes