Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03b134738130eae…

MALICIOUS

PDF

86.4 KB Created: 2021-07-13 07:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 48e4dd52557dd9f198403f95e879cba6 SHA-1: a09251048e2dce7e5e998ffb9f4ad83805d37792 SHA-256: d03b134738130eaecd6b53bed52d0f3293190379b374ddc16eb157faa64272d6
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 a large number of links, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to distribute malicious content or manipulate search engine results. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://andlupa.com/userfiles/file/61452579756.pdf In PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/8721c4e8431cc927866a9a0ff9ed88b7/rovezitalijunimudezerivo.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/fugozizetuxuk.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/f5799cd160ed1ecaa2de24f14fefceb3/puzixeropununew.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/selofuvelakogejuk.pdfIn PDF document text
    • https://wittnebel.dk/file/56316168557.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/a42b5eb65mte6rei7jhq601jl6/43332424590.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8eebc35f9---75004945197.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/dajoguxut.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed3b9359d0---85582749760.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210708110639_1715879107.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162286274450722328711.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/7ff611b4ce931fdb913e8231b0520ae4/17166521075.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085cd712d126---jenapabukovikikugefajaja.pdfIn PDF document text
    • https://beliangka.com/contents//files/pojitifasedorodebokege.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/fafojikefudasijik.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/9010590245.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ab582f954---932606712.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/puzizexokazawapebe.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0093f38269---bumozonun.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cceccd30134---xexiresazaf.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736a9556b9e---gudepesuk.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/gefolopo.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/wevulujulovapedurevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=growing+herbs+in+coco+coirPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16D 10468 bytes
SHA-256: 39547ed86edb469a26688b7820e8b0693b3be4495b994ba1451448203d23d02c
font_01_sfnt_off0001092f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092F 16596 bytes
SHA-256: f649c0a4336990a39fef3027e4f402beea939311ccb60e88ba1d5704c643cf96
font_02_sfnt_off00013450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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