Malicious PDF — malware analysis report

Static analysis result for SHA-256 c996d5402dd17770…

MALICIOUS

PDF

100.0 KB Created: 2021-06-29 03:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3722eef9c0e216ce56a9cba9d42f1857 SHA-1: 1bc98c3ac05b2b06f81acfbd3f8328be5781b179 SHA-256: c996d5402dd177704c3c3f4344342a5cb19b09c4a5c30705e7bc44ead19d50d0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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 https://allytemp.ru/uplcv?utm_term=ielts+fever+general+reading+18+answers
    • http://sosonomo.com/ckfinder/userfiles/files/59303073076.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/c2ca4a46a120bce0b8bbd93f9c1e2483/xepakikawux.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/fafdd9f464104ae53fe38863a298f0ab/95225819857.pdf
    • https://universal4shipping.net/userfiles/file/domuruxurusigup.pdf
    • https://dalnoboy.com/data/filestorage/upload/files/73869742965.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fcd4b29f3---linavakisebegi.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1992c608d---51937718516.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ade754a80019070a18e8dfb2cca53407/zavikifatomoko.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/1440b74f27cffcf01bd0ff05c0750c96/kovipusaluzu.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fbe5daf6b---10554831475.pdf
    • https://nutstudio.it/userfiles/file/65906525663.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/198374da621c063dd912b2c46dcf1c3a/labijukopo.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebbcc36c69---63758251676.pdf
    • https://brs.jo/userfiles/files/boreferobelije.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/0ebfd960cf43d3cf2e153d81608b4f3e/78819081211.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd6723afb3---99389955382.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/30ee87137e3a9f5732ed25299ca76281/22701430839.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098a2f525165---towukilutebugodozal.pdf
    • http://tubietelbar.hu/uploadfile/40565602096.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b77f1fd9d---39702139497.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/366ab55856a10fa94dc53c0381e518c7/77470347633.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160995102eb01f---vurexiwizevutujoguziso.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/1cf0adfb654c51768ab660af58eab63f/mutuson.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/0fe1a68dee42e6534e055ad9956237b2/85372552778.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f51001140dad66812c8e64b364c490ec/kejopixasafuzoku.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010baa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAA 16792 bytes
font_01_sfnt_off000123bb.bin
6a78f4272ab9816e7112860f36ec7d1ac0b14c7b5745871de132abf86bff63b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123BB 17040 bytes
font_02_sfnt_off00013c61.bin
93365008de3143d1ef081cb0c41a70c87b68fdab732daa530a8702f7749a9df1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C61 10772 bytes
font_03_sfnt_off00015535.bin
e5e1b0d043d94d6f52280733e730075614bdc213ddf83fd4299196ad990800fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15535 17288 bytes

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