Malicious PDF — malware analysis report

Static analysis result for SHA-256 605e8a04f35cd436…

MALICIOUS

PDF

122.9 KB Created: 2021-08-10 03:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b74026029270ee2dc3eb0f3136f2c405 SHA-1: be6a0d688499acf3370bc854f809a247a2f97840 SHA-256: 605e8a04f35cd436631ceee07bf42d1ed98ec0e2dc7e33b4a99334ddd8e5ec1a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics suggest it functions as a link farm, potentially luring users to download further malicious content disguised as invoices or payment requests. The presence of embedded URLs pointing to compromised CMS uploads and disposable hosting reinforces this phishing and malware distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d1bc5baf30f---15589069283.pdf In PDF document text
    • http://kleiberit.ru/files/file/kubigevozijamoxenabexadaz.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/nozuxotiweporabesujike.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/4sfslia3ubpg1i9q29j90241m0/karisufuzif.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608394602e1d4---goxuluzopew.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/xatibozugiwolizuperusov.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/abfeecbcc8b0552cbe6d2c38a5ebafa1/61727040807.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/d4lcdlsl83kcefn18k1nbkjfbl/79405023582.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/negedeninebijatepo.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/27c78f470285b0413a3086a3797b31d4/49021501426.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d7f5bc598---47984315749.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a579d574722---monekepifi.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/17384592544.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/042ab82b6b6e80ff31f3f1ecaab9ed57/88035050659.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a02f33a545---lizagoje.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16073504c5f3b6---98334934536.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/8ae324fed88c0b93d700526512a8d1e2/xogudezerubajedusitixiso.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f5b3b2a7156---73494242334.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/tazepuvejaporelexewi.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/vatifov.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/dubezolonoxowepoguj.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/pubuvegewokujeto.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/er9hs7cd6idaq8k3t9t32kl4e7/mugaxazaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+noclip+geometry+dash+iosPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000168d8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x168D8 23156 bytes
SHA-256: 1cc72636e14c88e0d07b062308f80daa45e222ed96a5f8ea576eb15158968567
font_00_sfnt_off00014f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F2D 11152 bytes
SHA-256: 0f1086d230760a662db27a077cb1504f3cf40fd4a44637cb7e6da1b760a4c338
font_02_sfnt_off00019184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19184 20100 bytes
SHA-256: 064ec947b029fafc957094c526f8e0d8999ebd66820d5ab3130878a0fcf3472c
font_03_sfnt_off0001c50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C50E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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