Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24d93f1e5f10df4…

MALICIOUS

PDF

93.1 KB Created: 2021-08-08 00:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 51c3b5d4b72e18674a93ceb2be9a4371 SHA-1: edbfbbdc1b0a7630311f209101048df566dd5bca SHA-256: a24d93f1e5f10df4d77832b3ae7d283ad31a1dbdf8e31d17637b0ed11330229c
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links and the use of disposable hosting suggest an attempt to obscure the ultimate destination or to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://aquatrustfina.com/userfiles/file/15759658396.pdf In PDF document text
    • https://mabuksusu.com/contents//files/48258887932.pdfIn PDF document text
    • https://press-centr.com/images/file/23077656987.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/8031857155.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/lujozafewugutuj.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/nitroiqkhfa47legce8rnmc367/65904055308.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/hd5p2gfc02fbsuicm7gags0bok/kokatukowid.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/57676027813.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/gigoranomopize.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/zivamagokojotuda.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/towujufuvopibubonitur.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/58aidqdujg87dqkms7aqlcnsg3/buvamolevamivox.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e55f1a6a97---25694946661.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/gadavew.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f78866f7c5431be46b7ee7fd576d23cd/pifigomovokibabodas.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/tilejexidefel.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/rosobazikixiwifilud.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/26664713293.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ceef292a7---50326716886.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/nakopenenidixijorokaki.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/32830344403.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/66158735974.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf4a5be286---neketelezegekuz.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d00b44a794---84972778596.pdfIn PDF document text
    • https://akemi.ro/hirek/file/6396164854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ford+focus+st+225+workshop+manualPDF 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_off000102e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF9 11168 bytes
SHA-256: 00c960d8b8e98f285c78a87d75a2db7bba68d7896fd588f7160705e26a55e24b
font_02_sfnt_off00013511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13511 17852 bytes
SHA-256: b5d7dee44a2233d7f9b641b0e6efc86f266fd92258581c0067801f59904ddba8

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