Malicious PDF — malware analysis report

Static analysis result for SHA-256 91452a24d4359c44…

MALICIOUS

PDF

88.0 KB Created: 2021-06-30 03:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f7cde55aa513426ac09137da95529a5 SHA-1: f9cc422db1ef9476ca7bcc82a92444188adcb0e9 SHA-256: 91452a24d4359c447493a3d9dd1903f80180aeb7bfc4af4426d466f1b778cacd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://queure.ru/uplcv?utm_term=how+to+create+a+link+in+illustrator
    • https://angkortaxiservice.com/userfiles/file/metifiromexutoboxit.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160813050929f5---dotufiwafoto.pdf
    • http://groupkaishan.com/d/files/67547560232.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea224b5aaf---62912208155.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/pu3c1j30thv37bkct62osatar4/48699555203.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/0cc9000b174691088a23db72aedb7df1/ripijajijuforigepes.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607730dd54eb2---25985715515.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607694abcbdd7---buzupale.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f99193048---dezazipadafulavuxek.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095558263e84---bimowipawebobupizisi.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb7c290c9---24515667757.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/bbe41d8bbe95b89a4eae5c155333bf1d/57093032294.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b411e1aa083---sogop.pdf
    • http://pensjonatagat.pl/userfiles/file/51474440203.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/a4a1af35d0f78af717355f226c5b8f31/22230902172.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/10afccc1f3619bce3356c58aebbd91c9/xifovawizipujuwivoxesol.pdf
    • http://konyaozgunmobilya.com/userfiles/file/tupagoviwugisudodorakeg.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/fh3cm1bn9irku7jg3fpfjcvf16/zimesojevezegad.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-6-24/20210624033217506831.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/5lca419p6oa8cccp5769aofkj1/jinusalebodemuneladuzo.pdf
    • https://hoalavender.net/upload/files/1616713173.pdf
    • https://bulgariapools.com/contents//files/46228013336.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/0f112f62c7b5adc37c829b391efc7aed/dozavufinaf.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_off0000f46b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 16792 bytes
font_01_sfnt_off00010c7d.bin
5decd08a39dbec67479e506c7ddc2f681266a56d11515b110af0402370f50b7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7D 17600 bytes
font_02_sfnt_off00013acd.bin
8f56376157290819d20be24abd1afc871ab2f96c81e83a28bc0f9e0684eaef37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACD 10492 bytes

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