Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4e9927c97da200…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 23:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 461c8a06fdb65ea54b60c215c2c9b4e4 SHA-1: 0784f14a909d0fbecef4cb2d2a1ec96315958d81 SHA-256: 8f4e9927c97da200e4fdc4c1c83e48a430986b58414fe9ed45eb203904041459
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains or compromised CMS upload directories, suggesting a link farm designed to lead users to malicious content. The presence of urgency lures further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • 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
  • 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://synerhu.ru/uplcv?utm_term=current+issues+and+enduring+questions+12th+edition+free+pdf
    • http://geologocarmignani.com/userfiles/files/489328095.pdf
    • https://rgcsmt.org/ckfinder/userfiles/files/rawiletubexulobowizega.pdf
    • http://ydyb.com/filespath/files/20210918232108.pdf
    • https://bodzlomu.com/userfiles/file/49093391316.pdf
    • http://vxclouds.com/userfiles/file/6176966982.pdf
    • http://korea-seals.com/ckfinder/userfiles/files/89689590343.pdf
    • https://drddvichitra.com/userfiles/file/50311697948.pdf
    • http://burmeseburmilla-allevamento.com/userfiles/files/68930759589.pdf
    • http://madmojo.com/fckupload/file/33122542721.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/tozanu.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/b56868e5d40311b2e10bd31595c6e486/zumenum.pdf
    • http://kibunajcc.com/ckfinder/userfiles/files/94529081591.pdf
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/103431325.pdf
    • http://togul.org/sites/default/files/file/xiruli.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/bd792b5d97ed82a7b67bd17d90f9d128/sinadedadogivativavuza.pdf
    • http://aaaexpressheating.com/userfiles/file/ruzivimunewuz.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f60d6290b8771d817c66b3d93cb6516f/lugidavonijake.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613101aec06b3---bagopalumiluligadijava.pdf
    • http://chandigarhdatarecovery.com/files/file/17960428619.pdf
    • https://kitchensofdiablo.com/upload/file/5289053692.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614138bbb2454---39440380369.pdf
    • http://artediapharma.com/upload/files/60194631440.pdf
    • http://betheaskssd.com/flash/betheaskssd.com/file/vajotuxizivujazoj.pdf
    • 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_off0000e261.bin
943b2ecb985ff35511ad8d8733c16df43af3f7f3d2002af955849b1312f6365a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE261 18260 bytes
font_01_sfnt_off00011243.bin
f7b2bbdd87b80e30968f0def49fe9c88a3674e2cef3c664c492ab0ac2ffa3247
pdf-font-stream PDF embedded font (sfnt) at offset 0x11243 11180 bytes
font_02_sfnt_off00012bef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEF 16792 bytes