Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78f844394b2bf20…

MALICIOUS

PDF

105.6 KB Created: 2021-07-01 13:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e7f9a630fea3ce6c41538780eb5939f SHA-1: cc4fa8b6aa91e013645e8b2eb0f9e24f29866b08 SHA-256: f78f844394b2bf202d377d2d742f3998bb47c666892e89dd0244e0c876c82581
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple compromised CMS upload links further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 http://akcjonariusz.com/UserFiles/file/kijodavawusukitamigagino.pdf
    • http://vtaky.sk/media/file/nidabatulonajiret.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcf49f314f---13020085025.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/33457945992.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/66ac0ac75f28eb3129f400ce1d5a8d32/loxujuxek.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/hsst0i0n76ivf5e1c2rraqvuh0/subusaxuranen.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60313e3e20---75955596914.pdf
    • http://music-summer-courses.eu/upload/files/kutamuwudimevisukalexa.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/b78bb41b74ebb9e881855da2f9e365ff/20690295662.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/01e8f4e65fff4e25e7571dfa6b7d27ee/pasubuzesuzitekora.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0716b5420---86339429263.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607b568f4ddc0---8968644657.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/900c8bf04db76925c9136f451136c781/witemuvubozanader.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4d115eb16---32306953567.pdf
    • http://aven.su/userfiles/file/kuvudujidatipupanoju.pdf
    • https://geneticapanama.com/userfiles/file/tadukadedatamupovipuzil.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb9fa9f72c---58221987142.pdf
    • http://ipublicity.cz/data/file/pepogudevotika.pdf
    • https://agatanorek.com/files/file/zozigirogemabejinura.pdf
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a24c8b2657---wudarilibajogeni.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/8309c0bbca73c9fadadb88517555f928/kazewuxisos.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/6c5f36bad3341787429cb5e38d26ad5e/6175010652.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/41a4dd4f4da4eae80754c27546e9d03e/rutejijimamax.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+world+tallest+building+in+the+world
    • 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_off00013a76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A76 16792 bytes
font_01_sfnt_off00015288.bin
495c155794216a70025671fb62266493b751353b109c896aa03062d0661fa448
pdf-font-stream PDF embedded font (sfnt) at offset 0x15288 17480 bytes
font_02_sfnt_off00018034.bin
33264408dfe348be223d0e77d6bbc76dc83ccbf4ef13108ff51c5d8990db8f1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x18034 10816 bytes