Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b4a30d7c6986ee…

MALICIOUS

PDF

98.0 KB Created: 2021-07-03 07:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7b6483c9c04d5217ea508395a8224fd0 SHA-1: 64d6a026c85bed258f393364363525aabc396b7f SHA-256: 52b4a30d7c6986eebd00b1073a2711be0acc20038f1c50df6de7cd5de068bc5e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to compromised websites, suggesting it functions as a link farm to distribute further malware. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://synerhu.ru/uplcv?utm_term=ppsspp+games+zip+file+free+download PDF link annotation
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/406760fe3835d660f270cbbac8c64a29/waxenaguwukozodagelemet.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085d162dd0b0---bopoxepiruwo.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855f0805be5---mididupo.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/37341680929.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///mejapob.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/2bff5e3688007b906921ad44670d5e42/xaturipudotetowefa.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/847ea227777390b5853638cf73a9293b/73108229917.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609859011b171---dinixafelu.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855d7d7cc1e---92050484591.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/63713402929.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa66c58ff0---pegisobebenizozudaj.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/353025897.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/37c7cbbb735d16fb161b9be1f5b2410d/76693462226.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/bojidosulejabenagos.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0528213c09---ziwanogimepunupajofuf.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/dg679tkvt8bbpf9odajhe86jq6/dalirijazeve.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9097036b3624d61a6fa5881489e577f5/51176334185.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071073a2a4d9---24614183772.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d3202201915f8f55f35ef5e1d7888e39/dubir.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/82252231721.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/27jqoe8kajsu1carqu371oqcg3/ruvamajosajediwebexozabo.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/rusedanidatopomigod.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/70455694431.pdfIn PDF document text
    • 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_off00011918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001312f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312F 10892 bytes
SHA-256: e69bdde2ac0d85328cb557a1d5cdc200b1a22383c2bc47e7a7305160c4aeee0c
font_02_sfnt_off00014a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A38 18164 bytes
SHA-256: eebb860748b7cd1f7f2002f59fff7e7ba88f4b8e785d652379dcff5776b7902c

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