Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc1e2104f4d9ffe…

MALICIOUS

PDF

70.3 KB Created: 2021-09-28 16:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9f8102abe0a4545fd577a5bf833fcd1e SHA-1: a237f6643d5b0e758b6c9a4509adc7f14d92a042 SHA-256: fdc1e2104f4d9ffe77dd14d564988a141822cf4fe20a1105c369b08aca4419d0
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous URLs, many hosted on what appear to be compromised WordPress sites or disposable domains, strongly suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://faradtvandor.hu/picture/userfiles/file/dodaxobazibate.pdf In PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6ad02d8f9---lufepaziwumudus.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/nasik.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/18141184451.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/gekefumivinexekidiw.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302c6cd3ec2---salolozogisekexi.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/50806321894.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/fevixuwazulewef.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/78300389626.pdfIn PDF document text
    • https://paperland.bg/uploads/file/20457911424.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/zevatagugosom.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/47535520266.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/jimawesenuwuwasinodi.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/84300166332.pdfIn PDF document text
    • http://www.polni.si/Images/files/nevuzabonevo.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614db33af3b8e---xexatevuxanadotusota.pdfIn PDF document text
    • https://primer-spb.ru/files/files/74718298933.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/5627489107.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434cf47f2b5---nuxatejojenef.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/polevixukoxinujun.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/fuleloro.pdfIn PDF document text
    • http://hkacca.com/userfiles/xofejukitomoxararipigiju.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/57723430862.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/69310768757.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/jolawasotevakig.pdfIn PDF document text
    • http://mdtrend.hu/files/file/vidivol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=android+not+getting+group+textsPDF 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_off0000b549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB549 15244 bytes
SHA-256: 2641321d445018b1f4100d58bc8fe54f204a9f5098ddb4bb97dd9cb42861bdaf
font_01_sfnt_off0000db5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 10540 bytes
SHA-256: 619f480fbc0f9ae0fd370b56e34ed8313bb548230925087fb76ba4649964a968

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