Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f9ac414fb2955a6…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 09:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1d6a0239766137ae7d5d4fbd7b7c379b SHA-1: 79ec6c88e4a416e35576b71ea4997b1e551c0045 SHA-256: 9f9ac414fb2955a6d2e98156d0f04a4170e2097e2b144716cbd7c42f99d520eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=download+gta+san+andreas+cheat+code+pdf+file PDF link annotation
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/t317hchbs6sco4da33uitmd9u5/70777045148.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/31679625241.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/78280204149.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/14368479046.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/zupelum.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/36101015138.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/tovisaj.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/80563669864.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/tasezomelasuvijizutazoj.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/32221642131.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/jenivozopaxipelosomu.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/th78d661tp8fl1j2mivtfb1otb/97506005657.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2451ca780---dejubi.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/be893a1bf1fb674bfc86379c18651819/lejexisajeb.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/luropifudumatiperino.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/72223745154.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c44e332eca4---wijowowasilabavosugapobo.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/1f25180e74a991fff6a1300484cd5f80/pokoniwagevexetuzevumew.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5357f50aff---tadojusakufaxeg.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f7bb505319557df7e2ff639d31fa0651/dokesuvowujuxas.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772e4857a73---bojudabigigibatavotepedus.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/savaselalulejoraxozikuxe.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/kekasotun.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_off0000ddd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD7 17636 bytes
SHA-256: e87c94b3dec700ca236a9b45708b0009b5028f0ab86d45e217e6c8c8e1b8ea3e
font_01_sfnt_off00010b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B49 10984 bytes
SHA-256: 676dcf0a2c813c9789cec7b4ad827589007b536cc59de1811f5e0a17c9681f3d
font_02_sfnt_off0001249a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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