Malicious PDF — malware analysis report

Static analysis result for SHA-256 759bb99dac7c5cd7…

MALICIOUS

PDF

85.6 KB Created: 2021-07-07 00:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6492f812271d6f7e593a50ff4a1a1188 SHA-1: a77835c8ae0298156468ac9468e185f4daf09a0c SHA-256: 759bb99dac7c5cd704a8d0b022cbc96b10e50b86805a905472f911a15a5a05e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 various compromised websites, some of which are hosted on CMS upload directories. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=ways+to+cope+with+stressors
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/cef8e6586753bd8a3850d63d01f67673/pexixo.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49b7e10961---11547111277.pdf
    • http://al-bandak.com/userfiles/file/74905307888.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098f39e15a61---57307425073.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073662b59631---65645580706.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/e847e86418d50f149d573d9c778186d4/55728204229.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be0bee0572---1841742087.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be15126f5e7---zixawug.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/2f16b3ddb437533f8cde2b8f5601357b/23056305225.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/9398e5e05239e0b47ad637aa215359f8/kerivifixiwatiwan.pdf
    • https://kaimano.it/file/gubevugiwuluxomabixirija.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160740d5698ca7---toduzu.pdf
    • http://brickform.cz/obrazky/files/499114231.pdf
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/fudukavibiranipuvirivo.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66aead869f---gojisifisigij.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/1db86717ad563c98f90d1dafa678f9f1/kifegilijipulapebeje.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/8f411a2b7824512eaa56a95564b55be5/xakenezijurixigazixi.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/ff189a5a32d176188ea9c5d4d3402cc5/69230574953.pdf
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/dagitiru.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb969bd646---nujesuwut.pdf
    • http://adamlegal.com/userfiles/file/vajolirajawejovisep.pdf
    • http://jnnycc.org/userfiles/file/41399123386.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d2e410e62---tatobuvape.pdf
    • https://smartmedia.ro/app/webroot/files/userfiles/files/belumofasevefosase.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c521b558b---gosul.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_off0000ef13.bin
a244beae04e7ce721ee0fb9dabe329289fa1e100c526cb2d2c478af0e057b0e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF13 10512 bytes
font_01_sfnt_off0001074e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1074E 16792 bytes
font_02_sfnt_off00011f60.bin
4dfcd1e1ce035da177dc32d8d3bfba8decafa8904ad3c22dcfacd5fdc668ec8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F60 16164 bytes