Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f86735a2af0e06…

MALICIOUS

PDF

94.0 KB Created: 2021-07-25 18:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 52da43a0258c1f777c9cf01e50fae589 SHA-1: d4c00f813381bee7d751795f6dc6fbc748b4850b SHA-256: 56f86735a2af0e06ef6221d5fa804dbe430ec0a9030c63ada2de7d4afd7b0488
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is flagged as malicious by ML classifiers and ClamAV, and contains heuristics indicating it's a lure for remote-support tools. The document body is heavily obfuscated, but the presence of numerous links to compromised WordPress sites suggests an attempt to host malicious content or redirect users to phishing pages. The primary attack pattern involves social engineering to trick the user into installing remote access software, which could then be used to steal information or deploy further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d18974523e---67909984844.pdf In PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/vezemolusutanapabotata.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960f4ae00a2---43315211611.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/768c4937a60dd401c6703d4dad3ffdbb/detodegi.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/74v0in1au7jot97t4sebv8d0f1/17455002805.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f61ba43195---43409064634.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/31610320921.pdfIn PDF document text
    • https://areicon.com/images/file/wivewelelimiwe.pdfIn PDF document text
    • http://kaies.net/upfiles/file/74886704050.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/ddaf3716841ea7e72ca937c9b960dfaa/vipimotexugowefuvu.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4599e5c423---dagukakufexilete.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/35998852116.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/jodazapesare.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afde9fc5c16---lasididerojomofiwej.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/10475e1035f4dd36c5193a86785edca6/regokojunoxisixizeza.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607545560ce70---puxaxuxuwijorigurameb.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/worusigazepaj.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/8088513503.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0358e68dccb7028fe12eccc74a605c0e/pogupifegalafodonaj.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/bezakulovib.pdfIn PDF document text
    • http://tonystelly.com/clients/873487/File/xuwabobe.pdfIn PDF document text
    • http://izdepskifamily.com/clients/1/1a/1adacdf247316bc4617b3617d965acc7/File/vabaf.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2db5be37e6---pebaririfun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=is+solidworks+flow+simulation+accuratePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDC 10864 bytes
SHA-256: db177e0bc9909f3bfc0cc0554d19373eabd068e70bd28bfc1f7df5d926195588
font_01_sfnt_off00012509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12509 16860 bytes
SHA-256: a9c041b7f9ba4e66cab5d1b5de2b5c7236f5de512a6a18609d195ae929020516
font_02_sfnt_off000150df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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