Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b375d2c9628b5b…

MALICIOUS

PDF

94.9 KB Created: 2021-06-30 08:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 926c3393bcc7fc0bf2724d0a4881ac26 SHA-1: 7b16eb484d9241abbf3f8dbd73eb3ed0be920d7a SHA-256: e2b375d2c9628b5b7ef4333214806282827639ce52c6ffd37a1c0ee2b2c7cb7a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL patterns and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/lb4de0hs747mnvi6iomucon8i5/76259750061.pdf
    • https://ce-mi.pl/uploads/userfiles/files/pumozitatinitajagiluji.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/365e0eb313bc9d49a3c6f9693e13ded6/95555290804.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988d023cc99---65021181844.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910a0ebc31d---48850222671.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ffee1k8c52a5680q2bb5nrdbrm/memajuditotemukoritepigob.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/6ecfea68fe5d645b94db9880277b404f/65180140403.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160982df22a4f1---xagiwo.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607388143cf2f---476155977.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d12040ff1---jufipudi.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/semobokugexarad.pdf
    • https://abofahed.com/userfiles/file/zitotalapapewa.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/l7c2qq44ld8n59fnn7477k8qd9/mawoduxugufuvabowi.pdf
    • http://whewfamily.com/clients/12004/File/jeganikogu.pdf
    • https://lavaecucebrescia.it/file/26208994611.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/3a638c4b3632a8f37441ad20025ef010/4632623097.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b663cbe5bd7---76424485868.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16077bab05b55a---kiset.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/5c4c5cfc9006d36b6bcad6904de17835/dixizumorafikezevatozix.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5d5bd80d1---rasimuwor.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beba8c3e25a---93161266831.pdf
    • https://mimpiindahsatu.com/contents//files/tozaj.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/1c9f96768f7dfa3647452844a862574e/18243351997.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=rick+and+morty+a+way+back+home+apk+android
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f016.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 16092 bytes
font_01_sfnt_off0001055b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1055B 16792 bytes
font_02_sfnt_off00011d72.bin
408d6dc68620281eff3b0434acedf7998271c252aecfb9a29c4ecca2d6fae097		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D72 11040 bytes
font_03_sfnt_off000136d2.bin
441eaa5a871318a0b44aeb6c64ef2b45a2f2a94813ebe6c66293fcc2bf890134		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136D2 20436 bytes

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