Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79b558c0490a86c…

MALICIOUS

PDF

89.4 KB Created: 2021-09-20 07:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4b2355d2679d819bf223d137d1d9b614 SHA-1: f6d36f30332e2ed556c5330c66473230dd374514 SHA-256: c79b558c0490a86cb9585adbf6eb37b885a6bf2acfa347cf44c13c3ce223451a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161332a7e5c7d9---morerizaguriji.pdf In PDF document text
    • http://win-sonic.com/ck_imgs/files/tomexemekaxabuberum.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614088b610c1e---mexadoji.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/97373736159.pdfIn PDF document text
    • http://schokobrunnen.com/idata/17764539638.pdfIn PDF document text
    • https://mfdesign.hu/files/file/25339119978.pdfIn PDF document text
    • http://panova-art.com/files/file/defewifolik.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f096ba106d---tafuguzipix.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/wiwukutunumubarenesuk.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/78899742753.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147e857580d8---nafig.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/63394362353.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/39019346826.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/matefedekepekamasizik.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/fikejawagoxiviwa.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/55334037387.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/texodofidavi.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/2192861470.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/verubadowolukepexox.pdfIn PDF document text
    • https://costarica4d.com/contents/files/18886671050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=amar+ujala+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 16232 bytes
SHA-256: e06ebeaa2bb94d9bf14337b0794fec2c9c4a66e30291689b6f6234bfe360c8a5
font_02_sfnt_off00010a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A58 20984 bytes
SHA-256: 275215b0dc25141ff51ab1d2d00dcf89570bb7c32f286cc0ee45dc5604873800
font_03_sfnt_off000141a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A7 10000 bytes
SHA-256: b437a6241e8a95e73350eb82d905ba62991f5e791f4aad3d98c4c053a9b74216