Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49c982faa29bcb0…

MALICIOUS

PDF

86.5 KB Created: 2021-09-01 06:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8706c5d2b97f16e9fa9627e81ba19678 SHA-1: a0e09ddc5275e82f16f5097de4ea5b8cf0d7f65a SHA-256: b49c982faa29bcb0c116e6209de66eebb61e0d525212d7c9bdd12afd14931700
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The document body is unreadable, but the presence of numerous links and the detection results strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://thietkevuphong.com/uploads/image/files/92507340442.pdf In PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/kalovoxibe.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/81144793949.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/90877150121.pdfIn PDF document text
    • https://anfauglir.com/images/file/63615989404.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/viminowanigewovofozawes.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/50660775259.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/jugigozon.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/dukuliv.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/98436274602.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb385645da6---28456732283.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/784483d82a819fd9790eae0e7e79be6b/94252216886.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/kapilusenodanesop.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b3b836eb0---36960880550.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/jusufefulufumerujiru.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/folowozusuxinawigu.pdfIn PDF document text
    • https://mahae.hu/files/files/42096813672.pdfIn PDF document text
    • https://aashianarealty.com/file/4843923668.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/luwavu.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/fonan.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/roxupujak.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/zisaponitemadokenebiduj.pdfIn PDF document text
    • http://sung1.com/upload/files/ruvowotozipivo.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/50133512604.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=crucified+with+christ+scripturePDF 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_off0000ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 18280 bytes
SHA-256: ef4010f1f5bdc642e3c2afb42dbbf6c77069345fd1ee92ee6cea9929f9f91931
font_01_sfnt_off00011c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13466 10500 bytes
SHA-256: 389e4363e1af6df6b23c5e52fe1d0bf26d77898881322895f00f9a762d0764c2

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