Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fd1847ea44d204…

MALICIOUS

PDF

84.8 KB Created: 2021-08-09 15:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8bea8d1b58fdd040baccac43c57d420e SHA-1: 9b8c563e2c96aaa9dac68794609453e5c4dd7d86 SHA-256: a3fd1847ea44d20411b79be635a1d81a76ab151436db83d4b9a8ba9fea4f6c5c
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious. The primary purpose appears to be directing users to external, compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dupederoselobaponu.pdf In PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/buvc86vtfea4h35v7sshoolg3a/94067346283.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b185adf3b---mibigevujuxiwezegemasofe.pdfIn PDF document text
    • https://asken.as/bilder/file/kevudogidasaputuvafejugo.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070308b9df86---vovubatukuzabitetil.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/785f6ac9182a38cc13f1ce338ca71f90/mesosod.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/98391571725.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a240be74---tivar.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c3904d96e65---92605991859.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7e5911f524d9706056778e6e86bd575f/tegita.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/zikonexu.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/bimedezuxalik.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/cf5b0265282326f2050229c335b2334c/45143156358.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/304885ec5ea1c927c36ff5b16647a75b/30641572936.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/dapijivexuluropaf.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/a15af4e626beb4e66513e1aa4f6380bf/15404199697.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/saxikabolodumidudep.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/23958ba4b67c8943144a4bd59c02f23b/16910693726.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/5d12fc2c69f9006ed4c8871500c0ab25/72493781980.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/rumilib.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/poredowe.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/doriboferemuvido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=which+of+the+following+is+not+an+example+of+direct+addressing+modePDF 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_off0000e339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE339 18300 bytes
SHA-256: d42a67d56a494ab87a189344b0c2d668a25dad23bbe0ebff96ffb73a67d871f5
font_01_sfnt_off0001137b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137B 11248 bytes
SHA-256: e6a0ac911ab117b728b51eb6e8a5bc7caa4503b8a1eb0a3d022bea5ba0b8d98b
font_02_sfnt_off00012d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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