Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee17be35d431aa5…

MALICIOUS

PDF

98.9 KB Created: 2021-07-18 19:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 90a0001c16107ccf23bf160bbe958901 SHA-1: f0bd28187e8f41545a193406c5c0b7e63ae53854 SHA-256: aee17be35d431aa5dc79c5476b01c569ad437bc8823a08d258d9b1af50686a14
156 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 distinct hosts, several of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9839

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c871aa33f77---89488413953.pdf In PDF document text
    • http://megat.pl/uploaded/fck_files/file/36930897719.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5503628304.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55981bb821---66510278137.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/93761917273.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/90bcbf95d79d342541f615e959fb7d85/nigigidoposinalipufodiku.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/8892908343.pdfIn PDF document text
    • https://polandpools.com/contents//files/malorev.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6d5cc9cdf96cec9e93f228a1e98341c/wipevajokiwuruwig.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/xaruzuzarufubosub.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/zeritabilukajozobuvibide.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/6dcaa7b6ed9d6fc1b08d12be0bc3a2a8/gobawudo.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/37836748305.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5014796632---rawov.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///94845111924.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dc33788411d---fekim.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/2426440558.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/kuviravi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160982ee39c5ce---88047546556.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/22174918713.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/pusowevupopovedufizavojuj.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/xebizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+highwayman+questions+and+answersPDF 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
font_00_sfnt_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 16584 bytes
SHA-256: 88418e996305e813936c72355ab09019590b69479157961c2529b80237e56cf1
font_01_sfnt_off00010b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8C 20780 bytes
SHA-256: 49f7f7018c1c754add66b40dbeb98976165e0584aaab5a2467e22fa9a3191c0a
font_02_sfnt_off00014315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14315 11056 bytes
SHA-256: 3878a182dc0153a603c1050734a5f9aeb6b2249c7b277c89f6c8c3accdd6e744
font_03_sfnt_off00015c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C36 1936 bytes
SHA-256: 33bbf1926fc5be138a27f58dedaf46334baf746ab56330df6828686ae1fbfe5f
font_04_sfnt_off00016521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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