Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d84e6cc9ffd0596…

MALICIOUS

PDF

85.2 KB Created: 2021-07-03 09:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9221ce953cac324ad9cc536b30f4bf0b SHA-1: dbd0a6e317c0dd30f856d648976147e1d4715068 SHA-256: 4d84e6cc9ffd0596b431dbdf446069e6c38ddea35358eb98c9c88752eb92f1f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple websites hosted on compromised or disposable domains, as indicated by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=causes+of+numbness+after+spinal+fusion
    • https://charterfori.ir/basefile/charterforiir/files/rupalaxezub.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/64151034c0e8c8f01b3c01d6acfb35ac/12690658727.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089f653363c3---31549144941.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5695e9a92---sejef.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da20cdb70a1---46293931555.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/tsb49lrhn6bo62q7duf2na5c7c/62230630533.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/87425f813a312a43ced97a4f8de34ac6/kasuboxapojulo.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/22a31fe2c890b5d4ad32b43dd9a7fb74/22071435111.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7a3e744ea---71722612454.pdf
    • http://keitbg.com/images/files/muberaxoroxepawomokis.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076496e36eaa---99249276454.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/89446543498.pdf
    • http://www.pattyn360.com/upload/forum/files/28900794477.pdf
    • https://aterhesseg.com/up_image/file/15202124325.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/mghaufeimdgsbq5jfultjd5li2/tikerusibefu.pdf
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/9d6b6e1c0071c89210c14cd5d21ae37c/64816737822.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/8d305f1997b8341756a38d12e8d27743/8117826366.pdf
    • https://migger.dk/userimages/file/dokevef.pdf
    • http://notarbrazda.cz/userfiles/file/lusezitazejurupekerozij.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/qap9jtf25q7fetnbke7qldo3h4/gikufurodij.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b545a77d9e80f6bb3aa864addda41dab/fomumelunik.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074c068d0c3b---jujazilotujelevez.pdf
    • http://sake2metustin.com/uploads/files/93733850121.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e8a9dfc2---94561562986.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e11184d87c---28414541525.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_off0000edc0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC0 16792 bytes
font_01_sfnt_off000105d2.bin
0ea18b2bf2a55cf4167711c266aa22bb1c78d09f2bbe3e1a45f5d9b3000c404f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105D2 15836 bytes
font_02_sfnt_off00012e96.bin
d4db9ef87f7f093aa50efdc06d1eb1dd8aba03483c2cd020d36420256b928982		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E96 10788 bytes

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