Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4cc1cc89645268…

MALICIOUS

PDF

84.9 KB Created: 2021-09-05 03:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e6e9c709ab0440d37dbc9a92e7d8ff88 SHA-1: 7f1ed36e39344ef86b95d40fb3a7e83522483ac9 SHA-256: 1a4cc1cc89645268da333dbe043e34861658ca4d09e6c459e593f013973477d5
156 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 domains identified as link farms or hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings and URL analysis are sufficient to determine its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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 http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/33543968977.pdf In PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611a16e287e6e---surovobipexibomuzofexi.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/dodoki.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/zixaniterorupugam.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-2/20210602174906787264.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/72773317741.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cc522fc64---10685952586.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///21964777942.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/95039078927.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/56443830824.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/beberigifaxa.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/39062744120.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/l8he8eu4hfd7puu09eob3jncs0/36101346889.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/79a53d8d984d0adc8c89f84a26444de0/mosekinuzugokuwufew.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ebbe29a94776fc7a4cdd9b2568f08cc2/xejolagulimenagasajusebuz.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/44082648016.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/vakekifivi.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/danaxinonud.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/8e0e44c5d004db08b71e01a99b34a1ec/96273179355.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/6373ca7926fa2edb90f095594f63d355/zawufifojirozal.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/cd84d7a59e9a652907a0316c8ff3d433/25769421522.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210814_624B1441A2186DB9.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/zogunerez.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16c6c17465---xujazozijawamuno.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/29079213240.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/205075a58ee98ce74d8f8905ef31044e/4915081474.pdfIn PDF document text
    • http://yoron.net/up/files/madaxidumat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=nocturne+no+20+in+c+sharp+minor+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_off0000e100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE100 19536 bytes
SHA-256: 38caee6c90c252a545e88cc1155da7c2d2c596cb469bcd04a938e02d5d49d87d
font_01_sfnt_off0001139f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139F 11160 bytes
SHA-256: 6073663e68d1b99187b6156f363226d53298f80931f71b46ffac6d54ecd3ee82
font_02_sfnt_off00012d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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