Malicious PDF — malware analysis report

Static analysis result for SHA-256 682241faed40b772…

MALICIOUS

PDF

89.8 KB Created: 2021-06-28 18:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdec48596769cf6f0e9a2799ec726701 SHA-1: 14e61c3a6ca21b262fd60b7a42c0d3d7d55ee48e SHA-256: 682241faed40b7725c1cf0911ab0e64a14b1aa7abe4a24fc85e672da9feff3a6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted from this sample, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://catamma.ru/uplcv?utm_term=peripheral+intravenous+cannula
    • http://tamker.hu/userfiles/file/wirisugajodetowam.pdf
    • http://tdvvietnam.vn/webroot/img/files/97347606360.pdf
    • http://solarhomepage.ch/fckeditor/editor/images/file/65357470120.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c20bb1594b3---zivizederemi.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/304474f15ca1dc02698fb7d5061868d1/mosipoxizabawafajawu.pdf
    • http://szao-spb.ru/images/news/file/76064276917.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a09480928ea---sulomugojefin.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/46a1a57fa23cb66223903708f7962c81/tumilajazeniterex.pdf
    • https://leosservices.com/userfiles/file/kopenag.pdf
    • http://xn--szabowski-tub.pl/userfiles/file/gejikugasafitufe.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/43c307044eb8fb93c6215d1bf85c83b5/fupujoluvupilo.pdf
    • https://rosycaffe.com/file/79282678230.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a47df66fd65---livanegafizodibevebe.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3984dd77ea---58750720473.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/f98920f1469b4c9ae34d3baee0068ce6/60861153759.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926a3e2f2aa---46019161618.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/addf3695e9c39ab63688ef777ab775d2/46850101768.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ae9771098---12383432719.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/t6bbsg61ggorp816cdtgbn6fh5/wulunedemuje.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/f9320911b8a1bc09e2dda05dbfb845fa/niminagobe.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ims3470td63bmu93bs8gnnk4td/vorinate.pdf
    • http://onlineticketreview.com/images/file/nebapivixogesufinuxis.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/rc7aeg9ffbslqut34eqkc9j9ad/fafexubakasovidi.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969cdba0dc9---74022647384.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16075aacf44438---ledalexu.pdf
    • http://evohome.pl/userfiles/file/gomulozaralitumamajug.pdf
    • http://murito.fr/ckfinder/userfiles/files/80532634228.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcb2.bin
a329bbc2efbd9d57f3a1d9510beb95afa3f836f48ab973933226a0918e2cfacf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 17076 bytes
font_01_sfnt_off0001297c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1297C 16792 bytes
font_02_sfnt_off00014193.bin
2852b04ff5073ad98345f9d66b7d8e9155083872b4081739302a63be3c948e96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14193 10636 bytes

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