Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5499afae823cd43…

MALICIOUS

PDF

75.1 KB Created: 2021-09-13 11:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a0ab7fb2179c4ea660ba31b543204f93 SHA-1: b955737329cd53e70e0956133639952f730ad497 SHA-256: f5499afae823cd4342b943d28678d2cc435ecbfb59464b68b3010f653f3185e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure itself are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=my+daddy%27s+got+a+gun+roblox+id PDF link annotation
    • https://y3stwk65l-mn9.com/contents/files/33664835498.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/65288524480.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/23182983930.pdfIn PDF document text
    • http://rc-modeller.se/images/file///siruxewuxedojenapiwef.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/85383749386.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/76267565592.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/51079533481.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/12492454299.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/59039353365.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/81507357210.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/59065305093.pdfIn PDF document text
    • http://lawngo.net/fckfiles/lapadulakagolurezarapo.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/vdrf1s3nttt38lfhqq7ft7ivlr/verenojufazobaluborilefi.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c338f5adba---52748981962.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/87268787643.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/81967518817.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/42491984880.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/mikanatonof.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/bf49154f6820c7ac9ff98cf7226af7db/34432447155.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613390f09e5a1---24393326821.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/58492436079.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/3897d02d4fa100ddd669cfac76be6bf6/50758205849.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/94315539497.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_off0000c12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12B 17364 bytes
SHA-256: 610e85ec490828103d1dc26cdd4661784c65a98f6abeafc500982b4a2eb612d3
font_01_sfnt_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10642 10776 bytes
SHA-256: 68d76c796c87436ada68131478bac23b9272b6276bf0914b8efc4fe5521a0527