Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae72dc3fe548b62d…

MALICIOUS

PDF

127.4 KB Created: 2021-08-09 19:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d2b61c13c6ad4efd6145e4196ca548d5 SHA-1: 97b8ff890117d687624970c9b78e4341ccca472a SHA-256: ae72dc3fe548b62dd3ff10b2ac642cb6abe18c5de0062ce4d92f51402ba34f7c
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, several of which are hosted on compromised WordPress sites or use disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The document body is unreadable, but the heuristics suggest a lure to download a file, potentially exploiting a vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://securitydm.rs/slicice/file/runofesituxadatubadulatu.pdf In PDF document text
    • https://aglogistics-bo.net/userfiles/file/padogupig.pdfIn PDF document text
    • http://elitvorota.ru/f/file/mesasaxatij.pdfIn PDF document text
    • http://healingpawswisconsin.org/clients/a/a9/a991db820639e3552774ed9a746c1e3b/File/92461294719.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/lebov4v18qn4t1iuqdccvd38tr/lutosegibub.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d5fcdd619da---18356979884.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/57838165598.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096fd4ad518e---xesozaxesujif.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/09fdb8a4349ddcb74d019104875f121e/ranogimediligera.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/7d32a15a7beae6f430ab3bf271038609/jisusodixod.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/tesuminufafusap.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5fc10c055---fokizamizufefupijijosoz.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161041bc855421---jigujur.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/um8gfm99t4bqha7bosmjm9a4g4/58435019287.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/23akdbfb4e5cjpm62k7jlgveuu/90540044139.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/junexesezilurujuf.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd1fdec0b4---jewipalodexepovefuxutugif.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610378bcdc54d---kokotanoremoku.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/29868779589.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/132495471231dac54689191fa20c8a6b/60329239410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=vhdl+code+for+3+to+8+decoder+using+structural+modellingPDF 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
font_00_sfnt_off0001780c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1780C 4580 bytes
SHA-256: ebb9e4c8fe0bd04ab34a79ce5d1581083dd810838b297f52a992cfb319d41f3b
font_01_sfnt_off000188f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A104 18908 bytes
SHA-256: e1b6b320c80917547efe1164a05673f9ffa39b6666b5803091f05049d9aadfc8
font_03_sfnt_off0001d37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D37A 11372 bytes
SHA-256: 47330a918f40e736076493a580980cb5aa6cff38944076637c263c40121dec0f

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