Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a64438ba33c501…

MALICIOUS

PDF

79.9 KB Created: 2021-09-03 19:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 60a99b4ce5a32df6e040435a064aa3c5 SHA-1: 94126b57f5e18836b3b98990d9e79c7464fa1308 SHA-256: 94a64438ba33c50112b66797db9454f79f3a4d31ed8c45a25ba31756830a8f01
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The presence of a visual download button lure further supports the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=cara+download+pdf+academia PDF link annotation
    • https://beauti-full.ru/uploads/files/mukumoj.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/5726142179.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/badimimalukarafe.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/61736624361.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/12902402495.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/8vuism3gaquniflh651il92leb/gasureposamaza.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/cukf56ir6c4nddvp1q9bleo3r7/50926679671.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/tidekexu.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/19980547597.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/dulimakezatagepo.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/xifesetujazilotusoj.pdfIn PDF document text
    • http://cedarvalekansas.com/clients/875954/File/58851831009.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/70799043773.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c0e7cf0cf---gogonez.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/kesofuzosumonewi.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/d031b67d237095f9b26a0f4c858f90bd/veripud.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/63810244270.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/10483380377.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87a9c1ea20---70856114538.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fcb976933---24970619806.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/nizanewo.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/betiz.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ee6a75e70---45338177847.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/durefivozowixideperakaru.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/211455036703.pdfIn PDF document text
    • 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_off0000d233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD233 18068 bytes
SHA-256: 4c8c980199a0e958ab765f259b3ae373942b9a3daef37defe29542d64b0cf9f0
font_01_sfnt_off0001018c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A3 10632 bytes
SHA-256: b38444b8560562fb24ef3f597316d434530d212a9793ae00522e82107e756ce5