Malicious PDF — malware analysis report

Static analysis result for SHA-256 3faa787b0a437cf7…

MALICIOUS

PDF

129.9 KB Created: 2021-06-27 23:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-07-13
MD5: 74ab4902d23bdfc020be55c68384f5d8 SHA-1: 38b39c12b4179a6bb9927cc44c6c11e4cf97d8bd SHA-256: 3faa787b0a437cf7774dc25e3194e032e1c49deaf5f9b2bbde93da65f590ed6a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is a common method for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9706

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=best+channel+bandwidth+for+5g PDF link annotation
    • http://allycatering.com/userfiles/jawidededopo.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/31705999747.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/sajopetedude.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b07257c2e---67627792469.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/18568559512.pdfIn PDF document text
    • http://upbfassadenbau.com/upload/file/pigudato.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f209d6bd30---76403668704.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/voh7jdl925m87nsuc0um63c9f2/paxapofimipemifoluw.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/50012716898.pdfIn PDF document text
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/69349429071.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/91785321557.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ahbs5731g8qg50msa0gjrgimr3/jufozisadevup.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085e81f84668---rewobi.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160982b63a823e---79516296899.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/2hq1fepv1hhcfp8rqtp771224o/72935768368.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7599f043f---23982821839.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/17184909336.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3745191fd7---53382888107.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/p38ntvmurdoou0d535hao2do64/36961242450.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/wopetunenaxunexorirekaxaj.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5dc2662d1---jizanulobajobuxi.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac072f10a40---62966563351.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/55caecf3d95bed71cc4fa1538e1831a2/31247330457.pdfIn PDF document text
    • http://nfc.soo.jp/file/82294626360.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB7 11168 bytes
SHA-256: 4a8b6bc04ce8ee390825078e97dbf0b3b4a4196c682eb0e61fdd8f0f5e0d485a
font_01_sfnt_off000164a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164A2 13884 bytes
SHA-256: 75fb20ef346cd3cf4ce9ebbf7bafcd40195ec5adefe203126176b7ad41fd2007
font_02_sfnt_off00018e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001a670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A670 17124 bytes
SHA-256: ebec0989ba8a1276641b45761f52dfe7c42cb9516ab11a2f8d0bee179a9c35f4
font_04_sfnt_off0001bfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFA8 24764 bytes
SHA-256: 41f70df01a9bca7861d788531fdc41ea202ca0ecc694d2548b4d99ad20598492

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