Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a891d496509a13…

MALICIOUS

PDF

75.4 KB Created: 2021-08-28 00:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d04a85688678ed958e91d209277d82b SHA-1: b1a8ed25c2267df6d8bcfe50b5b2f12952a46508 SHA-256: 52a891d496509a13c90ed7f47086682be31a2eb14a96a3bb5274e22fe00676c2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting. This suggests the document is likely a lure to redirect users to malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://csc028.com/userfiles/file/20210811075020_b995g6.pdf In PDF document text
    • http://agnieszkapawlik.com/userfiles/file/tesaxivumamudafedipesod.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/zixegumifenedarowew.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/fewinesexufi.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/77273906771.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/gokumasugararavajotodelon.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160844ca286b8a---zomujinopiwixarejapiw.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/4e4mi1gvj57rem3ijpdetkfnv1/91489541805.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ekv7gl2966e759vmabf3isq20d/lubuvafexiwegezene.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/67be7cbbba2dde8b553ef417b7d9d8e3/19962858249.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/2qsmu501gbbg009atgmsft1nbr/sufojimazezo.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0dc4237ca85d193126e67c40a7b6a407/26159226051.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/87289436981.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/41b8548bce6bc317e30898a95dc6337c/28898099526.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062605031052.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/83f735689021c2ee14195406d3b02b0c/zojomawibekisul.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16079e24fac937---78569507403.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/59651511839.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/60541772334.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/c677fe70d6fbdda4132f93deab74683a/mekonilomuxad.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e0ca3bb33---fagatijoxufomafinomuko.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59034067700.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/japemalewifiridonowepawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=tattoos+for+guysPDF 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_off0000c740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC740 10192 bytes
SHA-256: 6aeb8b540375ca2d9e105dc21b3da0e088311ec6b8c4eb50cb1952aee6ab99a0
font_01_sfnt_off0000de4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4D 15824 bytes
SHA-256: 702913c91d9e606573186ba9b3caef3849a5e3f7e5e4ab5008a9eb7be8b8c1ef
font_02_sfnt_off00010712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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