Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f810b3d301899f…

MALICIOUS

PDF

81.6 KB Created: 2021-08-28 12:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2103beea47961e53113b78319ec171ed SHA-1: 5c34374951449ae4e0d13179697eda3048674f7a SHA-256: b6f810b3d301899f196fcebeae1414c532601f7706c044dd8614ecc2521b60c2
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, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farm characteristics strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/werosomoluwe.pdf In PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/73ae75e52c4410a07a562b30d0571960/makurajavaxip.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ebd573392---nanufarodalufuj.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee483e2317b---34528454570.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/t79oloeo5l1audjjg27go6cqc5/84079496413.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/tixizesenazad.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/54051365266.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/89703806212.pdfIn PDF document text
    • http://akademibt.com/resimler/files/zujufaliwafebuladevejufar.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b390c1197---kezisivore.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/verasusok.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/lexug.pdfIn PDF document text
    • http://allasclub.com/campannas/file/budavetarexekasajoruj.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/80888011993.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/92578460283.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/49838278682.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/kovuvomufadol.pdfIn PDF document text
    • http://timebymtm.com/upload/files/21389811055.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/83937109719.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/94257692059.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/90884577824.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/sadukep.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/11636720310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=us+dollar+to+brazilian+realPDF 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_off0000d786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD786 10448 bytes
SHA-256: 146e6fa81036f3db1ab54ec63e0db34e41efa1d8c86a185560aab29f1bbfab0f
font_01_sfnt_off0000ef58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001076a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076A 18332 bytes
SHA-256: 4491ba25877333a19473de9030d8ed4b53829b5d208839661993878778c226a9

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