Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1a1456c02c9b8b…

MALICIOUS

PDF

83.3 KB Created: 2021-07-02 11:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a62c44a19f8e743a33f60c0fe1ab5615 SHA-1: b5d40e7a057c761f206decf59bda24044a078b6f SHA-256: 0f1a1456c02c9b8ba5d5bec5ec1735272872f33f089c5a13572d5623de7d2a73
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on compromised WordPress sites and disposable domains. The primary goal appears to be redirecting users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/ct3jedld1kenulnff0mf4nha8d/vowusajimufi.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/38jm59k4b6sfsr3uef1mtgcn1q/voralosipuwelubelawexip.pdf
    • http://arci-mp.fr/admin/File/jebapebivuvemamiz.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/2448a4208f3df52ca8889cdd4384b5cc/furixabebibarusonuvo.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6924c608b---31565551619.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084fba729270---17277606768.pdf
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/voxexarevewitusijezudetor.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/b71ef6c59e91693070499073e8773242/27158003974.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/aa62f8cc3670b3e0764186a35474c304/46214134674.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acc4d97df0---6368804397.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/913d343121c11848764a30ba421512d4/linexotujebupujilisomav.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080464b0f128---mowivofufikuf.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/bb080333370d7bbc0af2ec323edc091b/40183202625.pdf
    • https://directorvincentchow.com/fck_filemanager_upload/file/rinetejoxu.pdf
    • http://consulcongress.it/uploads/assets/file/fagepedurut.pdf
    • http://jkmdc.com/aversystem.com/userfiles/file/8440391135.pdf
    • https://studiopros.com/userfiles/file/
    • http://hugslock.com/app/webroot/img/files/zobamewomasuvukakaj.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/as154s7l99nupcvs0ittbqjj65/59467445963.pdf
    • http://chretkinia.pl/userfiles/file/63629855170.pdf
    • http://capmar.eu/userfiles/file/tefapixatabedose.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b818552c43d---72905046645.pdf
    • http://cowmoo.org/ckfinder/userfiles/files/wuxegukipugenabok.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=bjp4+self+check+answers
    • 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_off0000e251.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE251 16792 bytes
font_01_sfnt_off0000fa63.bin
6f30ec92195576863a594d34aa2e48ef37c1e166729a327fb9ea5772e31cfd76
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA63 17124 bytes
font_02_sfnt_off0001278d.bin
2bb4375c805a95a46a6b2ab518873dbbe79ba87705fd8765267566abde4052b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1278D 10704 bytes