Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d8d4ce0e60f392…

MALICIOUS

PDF

87.9 KB Created: 2021-08-29 12:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b965f70cc5c81c984958322bf9f0f326 SHA-1: 0c981dff7e4c5a3dd0bff6494506a3494994bc0e SHA-256: 98d8d4ce0e60f3923f919bb660a9d5e29dccc67376cf0b896d8390a99602d613
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The PDF structure and embedded links are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://synerhu.ru/uplcv?utm_term=fine+aggregate+meaning PDF link annotation
    • https://safe-international.com/userfiles/file/jijokewa.pdfIn PDF document text
    • http://dzbnf.com/upload/file///tuwukuneverikate.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/89017921549.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///warubaneman.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210819_517C5D03113CF9C6.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/a901bcdd4fd8946d4aae36a0e0462672/xorubonufabatadudozipogad.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdeb73f1de---54562632315.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d002896e3---vixeda.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/161040b0c1db61---fowezutesikewenupuzo.pdfIn PDF document text
    • http://oxi-dental.ro/imagini_ws/48180133153.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161263f18c273e---53238572907.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/3ec840f889de88265ea9f0d919179648/7528769812.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/5bbf8d3b84fab4eaaede6c7920c4bd77/donotevemarudixib.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/lrmik1j2jvikkiifumj753pofe/jasopakoli.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/b76ae88974dfa38f44168eb3ab7b289b/18319478358.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/vewajijerebevusekifajuxil.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210819034515758.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/xikaxekinogijozusamaboxor.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/a4cdc75f43e6c9c5db25250fc732e732/36710533722.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/mekofuremazotok.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d2a293b6d---4134491972.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba177250fd3---92269840075.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/woliwizupupo.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea3ce5238e---boloxopugu.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b563112eb1d---69614702497.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_off0000f62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E45 10092 bytes
SHA-256: 0d5dfd120a3b862c707166102a81baf42e4c306747c14838a769ef51ce6bc3d8
font_02_sfnt_off000124ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AD 17116 bytes
SHA-256: 2e5ecb51f5a15a5e69224d885d262202a3317b10461abdc89876354659613d78

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