Malicious PDF — malware analysis report

Static analysis result for SHA-256 38fd356697a2707d…

MALICIOUS

PDF

82.0 KB Created: 2021-08-18 15:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 47314c7137598de398b5df754a6190e3 SHA-1: 76a276d6e3217236eb8cf1de4c228cb27e100735 SHA-256: 38fd356697a2707d2b42694bb1f49908dd67a6ce3b5efe5f6abd589a2893ea5a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The presence of 'utm_term' parameters suggests an attempt to track user interactions with these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crewmak.ru/uplcv?utm_term=football+manager+2021+mobile+review PDF link annotation
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/6nuue6lvofuilie3b8t7rhji05/49569989236.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/43362564996.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210809_F935511A03AE2D13.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/f086638252f2977b87b4e57570027232/sideraxuwivuriwusudur.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b26464e6b---xevodekijuvij.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/fewajudemiwalavora.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/dalebozopetejowinenujag.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160827f4ac6e98---rukexudigefimuduv.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/e0b7b75aaf2790a629ce5162c44e1760/vanomakewubupupegoluret.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/5p9rbtpf4e96cmpn8d063au09t/98587333556.pdfIn PDF document text
    • https://eurotechcorp.vn/admin/webroot/upload/image/files/sidiwixaw.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/42104715419.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bec7d85301---81378977877.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/70fc81c77ec2b5ffe56de0430e92ebf9/47609482484.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/zomov.pdfIn PDF document text
    • http://fittbikese.hu/files/file/zapafetoluderada.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161083766edf6a---rikapazotaxiromuru.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/nijavinikipuvesit.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/7p47npamrhfcms71qi9kl5vch6/16641236202.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e626c0044---27745995497.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f3a15feaa---4139309231.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a114c68200c---sorojuwasejerejugevixed.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_off0000dc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC82 10844 bytes
SHA-256: d20ea2c7e4d83eecf7d2ab252f49948c2451e6dba3be0f3c0f45cf67a2b9cdd0
font_01_sfnt_off0000f59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59E 16428 bytes
SHA-256: 923cbfabd1bbb41282483b17bb24d12859333ec907a75d09a08a4c62bd8ea2b2
font_02_sfnt_off00012012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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