Malicious PDF — malware analysis report

Static analysis result for SHA-256 d01db5e1e0814a8a…

MALICIOUS

PDF

79.6 KB Created: 2021-09-01 16:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1caaffa128dd526f5784bf6f6e6f62f2 SHA-1: b2f9442f0ca12df762631a733698e0c784ffdd9f SHA-256: d01db5e1e0814a8a724c3066c2cd587e93abc18a33850be9344874685d6fea3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute further malicious content or phish users. The 'wkhtmltopdf' authoring application is noted, but the primary malicious activity appears to be the distribution of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://glina-master.ru/admin/ckfinder/userfiles/files/2122628676.pdf In PDF document text
    • http://www.mediagrand.hu//data/editorfile/xupipumigatugaxapakud.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fab82ef1---7650979877.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/96850283517.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/rimelana.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/bac0d2f9443a21e4c880a141865b3fd4/pesaxi.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/38898984211.pdfIn PDF document text
    • http://sy-smile.com/upload/files/28150907037.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160815eaa5593c---54860097843.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/8269872589.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7684c7136---powaje.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/zawavajupowoken.pdfIn PDF document text
    • http://langmypham.com/luutru/files/foviledoxotelikop.pdfIn PDF document text
    • https://rinducm1.com/contents//files/50746809608.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/vemotubofutivuku.pdfIn PDF document text
    • https://aaaxxion.info/images/file/72798711501.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/wuwavivoponeka.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/tubeketexolezusekesukaj.pdfIn PDF document text
    • http://alcantara.cz/data/file/lirise.pdfIn PDF document text
    • http://fitviewer.biz/files/file/silulirodigalinixumonu.pdfIn PDF document text
    • http://liyangah.com/Upload/file/potasifazevatu.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/juvovewelulademogil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=tommee+profitt+in+the+end+song+download+mp3PDF 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_off0000cc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 11168 bytes
SHA-256: 9d446d21b2ea431301bcce296769fccdbbb1a96dce31ad70c4bd14941fc67713
font_02_sfnt_off0000fde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 19224 bytes
SHA-256: d0dadbc512363447c5981c222cf719c697320b445f725d9893a657bbf5bb66c8