Malicious PDF — malware analysis report

Static analysis result for SHA-256 996db5367204ad9a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 11:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7234a716489b276b2d2d467cee112fee SHA-1: 1714932291aee074b89128da5776152502aafbfc SHA-256: 996db5367204ad9a49f467c9d9bdb693a6caa79d64174111bb0d266a06795087
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely serving as a lure to external malicious content.

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://wastran.ru/uplcv?utm_term=galaxy+s3+mini+custom+rom PDF link annotation
    • http://szerecsengyogyszertar.hu/editor_up/lupus.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/81421495606.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140e9c357675---xotivupifig.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/cfa30661152294bf8a0033b08905a967/wonolujimus.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/71776254298.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135808fbcaed---91930713967.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/najuzojet.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613563082c98e---50051783952.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/27304687060.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/nezagibizutipiranuxate.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/72684576422.pdfIn PDF document text
    • https://superchills.com/userfiles/file/77664036109.pdfIn PDF document text
    • http://cbstav.cz/file/rupejadip.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1608ed2af---javanuviwijosomanikoze.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/77445598017.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/16849953200.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/nujupenixakujuz.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/betatesojiza.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/ketofexoluzovalu.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/65151084656.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/42634193769.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/527aab9396e6f600748336edfa74968a/78197749799.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-11/20210911225422598642.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/rapotogefigudin.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/wotejoxabir.pdfIn PDF document text
    • 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_off0000dd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD44 10784 bytes
SHA-256: 93881310d660e1775139cbc1216ec0cdd27396c2b58549eccfaf872c7ea76623
font_01_sfnt_off0000f62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 18460 bytes
SHA-256: 3e5fef8a4a54bbdbeec560031a87d44352b5a828b30ee7c8f4271dbea0a7c14c
font_02_sfnt_off000125e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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