Malicious PDF — malware analysis report

Static analysis result for SHA-256 018e7e0cd3c9bdfb…

MALICIOUS

PDF

80.1 KB Created: 2021-09-06 03:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 235b35443abe4fb0aa8fee276ad8c865 SHA-1: 1af67ea203e39f8cbfe0c9a30b159d79ddfcd10d SHA-256: 018e7e0cd3c9bdfbce5cfe234e3ec813b373b790906fce0fc77fa2d83ef2d907
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and UTM parameters points towards a coordinated effort to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=i%27ve+got+a+crush+on+you+sheet+music+pdf PDF link annotation
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/802bd18913f43e21871d1f92d95b26ab/75496284672.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/95202516055.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/fikutepakodusu.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/wajaxopalor.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/warunizixezelisepina.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021062101083573499.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/041fdc79a5adf5737e9956e78d1ea39d/ranirabadonawopibag.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/676b03d41419ed5ce81718737ca95125/15566365990.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/genadazo.pdfIn PDF document text
    • http://air-con.ru/upload/files/xitogoderikakemamu.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/m2nboinvql90nn75njb6nu71ik/pusinazukopidojobad.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b17cb167a9984dca63c6978e1250c95c/xegozobalavunomatakudaf.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/2944b7820820553e4d3eb5b497dfd551/65807694172.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/6ul8en587c200rn3ula95sqvk1/36679520892.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620309299.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/eapic2pif07e5n6rk9f8lv51fs/4100412856.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///40885991045.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/061ac2958f52745af98494b5176b4832/guzabow.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/dc124eb4c855f41a03516eb118466614/26763082149.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3f999782---bivafi.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/vopitisepavuwesusixe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44C 17080 bytes
SHA-256: e91c5ccdf34fae788b41d7d8d6329501d76a531bee35d88cd3a4b3a447a40076
font_01_sfnt_off0001000c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11823 11288 bytes
SHA-256: 6856b3387c4fcaf5c8ccac28678d9f386d60344cb9dbb99ba04bb90c52e41235

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