Malicious PDF — malware analysis report

Static analysis result for SHA-256 15055d059c676669…

MALICIOUS

PDF

77.6 KB Created: 2021-06-30 09:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de7d3ac42bc98c7600465606692af591 SHA-1: 4951c54eeeafd1ed694120335381a00b9a91ef06 SHA-256: 15055d059c67666997f6f276298e68f180dde26aea816d5e7bc0390511fb27c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a link farm with multiple distinct hosts, some pointing to compromised CMS uploads, indicates malicious intent. The ClamAV detection and ML classifier further support this, suggesting the PDF is designed to lure users to malicious content or download further payloads. The embedded JavaScript is likely used to facilitate these actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/nanojikejinege.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/047833120b6c9ce9dcb5c4a76900fa2d/jojej.pdf
    • http://ya-ke.cn/admin/upload/ludebun.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085405894698---nevepuwadixeme.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2604b3eac63dc651240a59c8a3608354/79004066303.pdf
    • http://portalcom-b2b.es/img/user///file/_0736053001622963989.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a2fdec33c---83925560569.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c736140e7c---26653454493.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ec3671dcb96f67e9be16edbf51f9c8b8/53416255331.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/gh636bql9jvcjir1kto53u5j17/tivow.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/a91318307a8ebff45fbdabdd45e1fba5/70154369615.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090707b5afe2---91277700180.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16099bd1b88fd4---wefukolanaxofuzotetemile.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f9fe2d62a---xesibupox.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/eee4ad51eee854c29c6ab60d1cb88b1b/16877198060.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160af219c8af09---gogulawiranepotuk.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/uma1c5bl2bucuc3vsq7l5hu4a1/82162947483.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d60519e17---9339594812.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17e8bba6d---78991514897.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cefae370e---67489345937.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/1f96573c682de41ea482f4ae83764a51/66872098571.pdf
    • https://premium-house.uz/images/file/99419120523.pdf
    • http://hiace-yoshikawa.com/js/upload/files/44079063612.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607585f404a8a---vejabibofifonexebusip.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=fast+and+furious+hobbs+and+shaw+full+movie+subtitle+indonesia
    • 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_off0000c763.bin
26a52dddefa8538a1dbf618320a2211d2170c4ddeecdb554358ee4303925d503
pdf-font-stream PDF embedded font (sfnt) at offset 0xC763 10988 bytes
font_01_sfnt_off0000e0b8.bin
376be40697944768711993936bcc028bf50600ffbd68b5e906a7838c2f24ead4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B8 17680 bytes
font_02_sfnt_off00010ea2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA2 16792 bytes