Malicious PDF — malware analysis report

Static analysis result for SHA-256 809e2fc5e258df11…

MALICIOUS

PDF

94.5 KB Created: 2021-09-02 05:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 01bdd10d44a824e0bd0423230afc0968 SHA-1: 5bc1b480bfb733e0232d48d19f49fe0f9b76f7b5 SHA-256: 809e2fc5e258df114233e37a5023f7abff1caec8a44bb7cc7119c0512da8e18e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, but the presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to direct users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://allytemp.ru/uplcv?utm_term=class+10+history+chapter+1+extra+questions+pdf PDF link annotation
    • http://alliance-ltd.com/userfiles/porilorebon.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/64336523678.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7326844ae154443da199440b33515ae2/48372070762.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ed1eda6ef4a173bc10b7308c0d5ee8ae/37652746414.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/detuxixarafipavigi.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/2dke4ajc1volbfa6mahlkompg6/23563763327.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd49b9b3785---3683201227.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/92763124196.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/nafibuvofinorob.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/92771014636.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/43244715085.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/ac773ac45c96916639e943b868a4a245/16871359610.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/34605227640.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/mawarorapilevapoxipi.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/faxipexivizo.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/nadujosigibakegoxikow.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021081523535733.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f8a8ec86fb34d666a0e6e734aa9f0c86/miboxiguguf.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/gofebonigubikul.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/ramijizovuvetol.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac611ccf4f4---78389190534.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075829749068---mewix.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/larodovipu.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/sudikuxafap.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/23760913532.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16129d330262b9---6108441121.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_off00010450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 19996 bytes
SHA-256: 63c4e6e75356874933bea6302d85d3c62bce2d2bdd6e8321162e2bae867e38d4
font_01_sfnt_off00013821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13821 11384 bytes
SHA-256: 81f6b81015334d6e8a15bfcc9537c58ddc91049ce90ac6ad153cc3e52561c053
font_02_sfnt_off000152d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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