Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb831c1e85a9f38…

MALICIOUS

PDF

84.8 KB Created: 2021-09-07 15:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d274172870cbafdf6017eec3adb6e485 SHA-1: 5bbc4af856dad3e8c3bf891e4bd4df2ad6157daf SHA-256: adb831c1e85a9f3831f66d7edf0b2c11a3e77171e8b6093526a39ad3feb7807c
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress upload directories. The presence of these links suggests a phishing or malware distribution scheme, where users are lured to potentially harmful websites.

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://oniceh.ru/uplcv?utm_term=irs+form+1040+tax+computation+worksheet+2017 PDF link annotation
    • http://baby-daycare.com/uploads/files/202108220604392300.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/kefigawutubuz.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/walaxodexisenor.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0544e742dc137242d140d6f0d278a1b7/29304754284.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/bec7375a3ecb8c2b7e107a79a385085f/sowadezesiwodipamudoje.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b81899cc---janowunoxixenet.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/molh357ik8mj178se83nt140b0/25061037794.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/lawigesifeje.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/46965502145.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210627_1182190AB32F0D13.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609150b484f7a---2588692314.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/59551114459.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/58294602284.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/morov.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/28968410593.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/62706840808.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/zonas.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b40e90a4c4---kulakaposevixofasewi.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/femumojafi.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/bikoferasitedusiredi.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/95916504117.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/filap.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/af5b33637e7ca14235a88096e0cfc8bd/38175492080.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_off0000e496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE496 11452 bytes
SHA-256: 81d128de329a1e2e100337f7fa6fcfd17af22d915893845cd35ba842149bcdd9
font_01_sfnt_off0000ffb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB6 17508 bytes
SHA-256: 9d8df19048a9d08871b59fe5b702946f1faef5b45d819c4f5f68ecb7ba3db2ed
font_02_sfnt_off00012d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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