Malicious PDF — malware analysis report

Static analysis result for SHA-256 816d98ba46d9db24…

MALICIOUS

PDF

86.2 KB Created: 2021-07-30 16:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26aef883db2d3370de9d0c230da07f53 SHA-1: 84d2483284e4a18e190fdcdebfeb8eaa8c62a9d0 SHA-256: 816d98ba46d9db245ed7d5911629cdff749c6f2b1df7b98c1c4f8cd192ed2294
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be directing users to potentially malicious content hosted on these compromised sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://simpelms.nl/userfiles//files/kegubugikobitimonon.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/d6a0562689dddf4400931eeb24005609/selunijen.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/1l4f2fp6vv4lrmvl5n6a38ufg1/8464493012.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/1710b1feb2efe3a7172c64b13ef00c52/9688997772.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072004bd773d---67222286375.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/d17ddda6435639742d502d10e68c0f12/6348122636.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/67c38d0c6bf0d1685eefd3ea11c67b71/21170949340.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/eoh3m08jrqd94imn0mq4donkdp/radiwabesitakowom.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a986d522b41---bikuzigejasediz.pdf
    • http://gnatowski.pl/attachments/file/visesijerinumimibutabume.pdf
    • https://kede.org/userfiles/file/65401203605.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/6fc3313b3bf292cafd59a70c917f77f8/21293659443.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca20b6e558---35058880198.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/hfmm3tur5m2d4sql1d6skv1iak/porudekuposin.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/283a998ba5a1610e9f8bc240fd0048c3/75102944277.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/b0b4c7f0f8e2475be46fe5299f0355ac/sinozafakidowamet.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/b6eis0n3hs2ctsrgecddclap41/32429840977.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f95e4cea5---sokofuxarerasugojibelo.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c8459afa7---82625348479.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dab0b188e0---lunafibix.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae4cd2480d---vumepego.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b774b95339f---jazebomimuroxages.pdf
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/83123120701.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=descargar+biblia+reina+valera+1960+en+audio+para+pc
    • 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_off0000e75c.bin
b0b0aec8cb3a7234811c569456556482f2373b55c0e3955c265a4e6e036c2bea
pdf-font-stream PDF embedded font (sfnt) at offset 0xE75C 11408 bytes
font_01_sfnt_off000101ee.bin
670f62957ec624da9ec7e18a9879d39405e37fd1a9794440317b828bad42092f
pdf-font-stream PDF embedded font (sfnt) at offset 0x101EE 17884 bytes
font_02_sfnt_off00012fc7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC7 16792 bytes