Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae08bd444c7ea4a3…

MALICIOUS

PDF

93.2 KB Created: 2021-07-16 14:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5572c674cde75d2d6f8d9307d6044c8c SHA-1: 3e910c7a1c43300d1dac4f96373de5f0de5d2e51 SHA-256: ae08bd444c7ea4a30a84e4329401a28d445859130eeed6dc127660b6d29f1a5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/aajithprqec53cnq54dfm21n4p/sogarolex.pdf In PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749bdb5d107---barofejodobekaf.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc7ee358c2---96079222123.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/masulewulawibuzif.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a581dc37598---15234187499.pdfIn PDF document text
    • https://argumentua.com/i/file/59314844166.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b4c38c8f4---pigugupakubenopozitej.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/92539944446.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210507044800591.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/ab2c0b0ee8af33a2fbb175d227da868c/1722073794.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/72349463388.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c724cafe3c---fimabumetizax.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b3ca9b4e1ab51ae23ac1eaa705ed19d8/13590890148.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608554186abea---kujogadazer.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/61755134058.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/fovefof.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c59b9b393ffe7b310c6b9860265e6797/jomopi.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/39d7f0bf99e04f11397374b32699bf3f/lufovilofivibuwexu.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ndm4r58v3358bmbqkfg3d7c172/88698407606.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/15845564085.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/gexadudikikajisuf.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b5aadc421---sepopesojuravakijaj.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/wetesinago.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/26056130944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=meaning+of+halitePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001458d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1458D 19868 bytes
SHA-256: 1e929894468860bca2730c835010a92da20d3574abc51e3e75240d0ff95edd43
font_00_sfnt_off0000d82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 10216 bytes
SHA-256: c4c3da9e2394c333deeea891383e2f66937963e664129b3ae413248839b3d16b
font_02_sfnt_off0001070e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070E 2144 bytes
SHA-256: 6ecaf0302489883c0cf4763fc1bac4d3f8d5f71214a0957d7a2daf466b4745b9
font_03_sfnt_off0001108d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108D 20168 bytes
SHA-256: 847fea1d1b787cca01502ab2c4a9e10123e2c99b831ab9f9782600b06fa2db37

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