Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0a919f5e19b0d0…

MALICIOUS

PDF

85.4 KB Created: 2021-09-18 00:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 329a18fc4bbbd1bc1b803d61a0f334b5 SHA-1: 7080f42a396ae95abbbb79f781e8c1695bc2fa36 SHA-256: 7b0a919f5e19b0d0de6ede883f82164585cb5e9ef94213e80c1faf5cc613c344
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, including links to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://milosislandrooms.gr/userfiles/file/xopumuxetipotebakipu.pdf In PDF document text
    • http://rabotatver.ru/userfiles/admin/janupedalomidubotura.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/zerugitijoku.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/34167260698.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/54378675466.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/95987714708.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/sinew.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/82388230176.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614364bbe8296---63294600627.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/46326419993.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/xuligegulonomivoberokige.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a78760f1f438e4cf87f76e36d4238edf/pamibuzuxoxegoriziga.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/29781508579.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/tupemeroza.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161446a5f74dd2---44141306985.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/gugasofivu.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/6794383074.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/75545699910.pdfIn PDF document text
    • http://novichiha.ru/pic/file/mefekawikuduvazekane.pdfIn PDF document text
    • http://sinners-party.de/media/file/48322857658.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/bavuzoviro.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/20900314725.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/be10d07ad0a93bd4cc505dd2bc1ceb9f/biwezewilenega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+i+find+my+files+on+my+android+phonePDF 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_off0000e8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BC 17620 bytes
SHA-256: 0852f58c5a0482040bcc1a535bfe7c3480318f903cea54610fd45f40fce40a9d
font_01_sfnt_off000116dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF4 10856 bytes
SHA-256: 0e365759fa788b942bf37075cda00d0111e510309a8b48ec3c33efb3ad1d9ee0

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