Malicious PDF — malware analysis report

Static analysis result for SHA-256 42beabb49c64c9cd…

MALICIOUS

PDF

158.4 KB Created: 2021-07-05 07:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f1cfe024b1919610be2e8c8ffab58389 SHA-1: 51ff2227170905c2f4516bfe256dce5af4e66284 SHA-256: 42beabb49c64c9cdc26050d0e794d52c5801317173c7adec7c637e82e45e55cd
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and the link farm structure suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

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 http://altelaw.com/uploads/image/file/xagexamugafod.pdf In PDF document text
    • https://noddy.nu/images/file/baxavepazesefavi.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/79887626957.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/zuwokigumapimesokuwisosi.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d93a976535f---nizadalot.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/43398930319.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/kigufefegag.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/tuov6ubr4h0vdaiftartg4ooi4/pizem.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/b303hfa34efercckeadvch40c5/musifesujafibikifenir.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/79992990519.pdfIn PDF document text
    • http://blueyee.com/upload/file/12122356794.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf18c5d6cc---96213859977.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7691b28f---biraxaregonof.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16097f56ab812c---kojixewarobunedesozonog.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc845d9eec---9067919771.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f1748d77e---10910677814.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f87f067db3---vomosisexiniw.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/87166790004.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/33929651652.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/49076iupbmva6ggj79cc6im135/36601057936.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608654d62dd37---88806829943.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160adb0c4f1ef3---gakalakomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=monsters+in+godzilla+king+of+monstersPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E44D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001fc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC64 10844 bytes
SHA-256: e8e3298456f840d0621c0e2a012f166cb7d20679eccf374bac1b05a434daa477
font_02_sfnt_off0002153f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2153F 22288 bytes
SHA-256: 5ac4c428f7db14ce9385d000c2c433e9b0a098ff6f2357c5d2cda4cfe7781b73
font_03_sfnt_off00024dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24DAD 8780 bytes
SHA-256: fc48b74c5579c7c2661233220fe6ffede220206406862a83348a0a9a54901137

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