Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05b75f0cae1c7ad…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 12:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a0c253db1e851e1e1b314b006433189b SHA-1: 54f849eb751370f20bc56f7ddc254d7c6f70109b SHA-256: b05b75f0cae1c7adb36cced32b49780d01737d1d504b780f8cec9a4d4946ad4e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to unknown PDF files hosted on potentially compromised CMS uploads. The document body is heavily obfuscated and contains no readable content, suggesting it's designed to host these links rather than provide information. The primary attack pattern involves luring users to these external links, which likely host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://takeacode.com/user/d41d8cd98f00b204e9800998ecf8427e/file/bufurujitaxagiv.pdf In PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/081ed6d3dc845b032626b4be5548e5c0/15631247407.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/rinejerabafupowevo.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/57339044476.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aff1cc7b67---91643251638.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/kemim.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a97e7bd1fff---1549384599.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/mexapokepuwewokinetexepav.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/gidakev.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4c40f6e35e59368ca36c4df29eb9552d/legesubowavilek.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/67094764083.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/rolojekebamamuvo.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/miborewogalukutobe.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/motalotexa.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/27474513634.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-6/20210506043549658553.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/22570930459.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/59253a02121936d6815275c5f1afe434/fofapasuladigesal.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/98sgm6svcot9lf1fltml0khh00/lovaninezugoxufutesuw.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a453ab8ba2a---berobonowivumov.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/61644832416.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d4dfad026a1d83441283e33432068637/xiveberozigavove.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/dajuxulidazekijisuvifud.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/nozutevuxupefegirinefelif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=cranial+nerves+list+pdfPDF 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_off0000d936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD936 16428 bytes
SHA-256: 7abb09730295abcfc83698a3158a1e78f15fcf0b283cccefdf9527ff2431c432
font_01_sfnt_off000103ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CA 10468 bytes
SHA-256: eb9265554d9704f29c0e34df471c83d2c7899f0bc765584ef08b15a8a220fb68
font_02_sfnt_off00011bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.