Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d98bdbb03ac0d62…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 17:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 05b7d4bbf53a40516a3d0db899650075 SHA-1: f4b2a213b4ea8787d8ebd23ec7ecb0cec4391800 SHA-256: 1d98bdbb03ac0d624a090946e0a9ad1ebb7fc2e6380f0bdf5ad7d199a9f81c2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains, likely to redirect users to malicious content. The document body was unreadable, but the heuristic findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sanders-scottfamily.com/clients/26926/File/xasoz.pdf In PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/bosutotejororopuz.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/6d7e8e3c065b948e077f2dc40aab9fc7/dulutidaroli.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28c647eca3---numifuj.pdfIn PDF document text
    • http://okvin.org/userfiles/file/baxepafapo.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/xopisitebapuzimiboxujog.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/25355043292.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/663b52e3b053d198a420054183ed6ff8/liwutanamubiluzaseb.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/webatetifi.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/joxuvavoligosawonap.pdfIn PDF document text
    • https://tonitomov.com/picture/file/53502998400.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/43095988232.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/rarapijame.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/wixivikuj.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/8d90ea0a242d7ee91cbf5de7e47f83df/jalokukunibexoginenuxir.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/judukelivime.pdfIn PDF document text
    • http://ccl-ciecie.pl/userfiles/file/52110833953.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29280126257.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/koluwuxuwifenawa.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/44053163452.pdfIn PDF document text
    • http://carszana.com/image/upload/File/6387489734.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16112bb42d831c---81324008120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=2006+jeep+liberty+diesel+repair+manualPDF 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_off0000db3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3B 11232 bytes
SHA-256: 9e70429b3ac37800c6a79377400430419e887f8c65140cead85e2c9934ad0c82
font_01_sfnt_off0000f552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 17100 bytes
SHA-256: e318ee6568e6019c3e24a63b193eb24c4b7976fce97cdeb1373f31eb11768491
font_02_sfnt_off000121ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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