Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44e34d06623cf18…

MALICIOUS

PDF

95.9 KB Created: 2021-07-26 12:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b2fe87ab61c369c896b657158fbdec1d SHA-1: 5dd231712d40cdb03d3c3c13d0bc6730f706b7a1 SHA-256: a44e34d06623cf188b8c1e5a9301f768fa61eacea48838f2f8e8088df26f6dd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of numerous links to potentially malicious content justifies the phishing and malicious link attack patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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 http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608770fd717bf---54268642922.pdf In PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210609105842.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/48146453140.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/jaxinijonemusi.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/14c31ff4aa155614818ef2a9f7f5fdd7/zutasopiv.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b48d0cbb8---ruselokajezizuvav.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/672379083.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pidijoxawupevijitokibi.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/f26f2d352a6bf7eb4e0a924c35e32429/55954250977.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/4be4fead7bcb9b109a06aeaf63111ea9/kifinojugututobowapefo.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/vta4ircku7dbqilkabaegsl8gl/daroxiwobejob.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/1e87k0ql7cuestv1l0i6m7cn26/3872568510.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/68r72iq7jsv73k21n23oip8otp/fibaduvikufexutu.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7f68258877774db76f47131941bf4dd8/ditexepokosuroximevowikap.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaa3411dbf---8751431508.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/5ljgpgpomhf2vl3qo6819b7f1v/27941500876.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/jovopepovasodokebenuji.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a660ccbc734---87939468279.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160855d3cc9900---kalumoxadomisako.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b52e3f462---zujereribolirafuririses.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/eec5e1f8d01877b0e354b78afaa998f1/junarobaduvuzanizilir.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d73dcc4060---27970371284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=velozes+e+furiosos+2+filme+completo+dublado+topflixPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/346afb959d91f7a722919dc699339777/90444198067.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 11168 bytes
SHA-256: 14d9caf78646220c7df8d84e5ba2b786bf5783e2907469eb2fbaf3a7c3cecf0a
font_01_sfnt_off00011130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11130 18860 bytes
SHA-256: c6dadc3ff9b2f5854e83ef1e4dfa0318bcbcb38ca2209bc73ba4b7e116c5b463
font_02_sfnt_off00014103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14103 16476 bytes
SHA-256: 1c903bf69fcd60c7d4753e8449dacf9f855db4e951ccca4ae3ca0d33fa9de78d
font_03_sfnt_off000157cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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