Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f725625d449055…

MALICIOUS

PDF

88.2 KB Created: 2021-08-06 22:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0c21e2515e83e276e8db163c15ee1516 SHA-1: e04f177d74265fc145ad08e497cfd3f314166194 SHA-256: d1f725625d449055da332f9dfa22ee9eae50ccefeaf17f92c263b9ba944470cc
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Tampering

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious files. The document also explicitly instructs the user to disable security software, a common tactic in phishing and malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://gift-founder.com/archive/upload/files/baretefabekemuxuzuzubiver.pdf In PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ed27b192e18---wexezulolopanafalurolemeb.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f95f812b0---17565645008.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/57142725567.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/20613737677.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/76787951620.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/dudemevifeteganesadesux.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075116abac44---mixopuwobi.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2abb418c11---1001858518.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/46350184844.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/vawemafurupuxiwa.pdfIn PDF document text
    • https://kultmotor.hu/images/files/vifememufigu.pdfIn PDF document text
    • https://profesa.net/userFilesfile/45999408471.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/444024070.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b315dd29d---gorigekusoled.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/bogusidozowok.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/0d4f4be344153e14f4d79ef3ffc904c7/81419573138.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac6f6cb79b---sinanogetutifabizoz.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081afb6d2edf---68939353789.pdfIn PDF document text
    • https://genegurumiraclehealer.comuserfiles/file/gezakosolisusowafipirite.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ea7f61b72---28827759914.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/0c8a961f1964e8bb764b9f0d7ffb1789/36184175873.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/35731172994.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/xalikidotutatiketefadup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+grand+theft+auto+san+andreas+pc+highly+compressedPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C8 11368 bytes
SHA-256: 2687165a6f4201a99b3f39c557c2483a95bd2964d5ac0893e3502d6d21128ee2
font_01_sfnt_off00010b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B38 17288 bytes
SHA-256: d9b2e460b19715866ba63d50b8a244851de09017d294c2775adc1d0c84c1941a
font_02_sfnt_off000138b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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