Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad38a3e69971d71…

MALICIOUS

PDF

74.8 KB Created: 2021-09-05 09:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 95008a8ee41fc8b218abdaf89d1e4c37 SHA-1: 426865064e2c57f694718ee791daf36c1f505de5 SHA-256: 9ad38a3e69971d7100e15a245400f8ebc22d0bf6b72084bf08c59d2e6562dd2a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites, likely to lure users into downloading further malware or engaging in phishing activities. The presence of multiple links on disposable hosting and the use of WordPress upload directories suggest an attempt to obscure the true origin and purpose of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b503d9f09d---8055410856.pdf In PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/4f4b469a053a207cd877d1e09a7708f8/14297820681.pdfIn PDF document text
    • http://glttek.com/userfiles/file/bogezafomewirurigamiv.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/jaxurozazedegalinu.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a86a90aeff---wijigigitotukobawazanijex.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/67018215458.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/4b8c1df175b60d9971eb87d462d638ef/88877618934.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/96890628014.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/37740a35ca8f9762cf670701700b8fd4/zonax.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/de0aedb08f8681acfaab80a78899a3e1/43861409812.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/23460107902.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/49305707819.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/88886842146.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d35316b6---letigosegolip.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/zutedagalujuzepobose.pdfIn PDF document text
    • http://rayanchem.com/d/files/kituzuzovefejivojulu.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/54925467552.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/49304432962.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/wodamedexenukajanajosebid.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ca6981625---8838241113.pdfIn PDF document text
    • http://poultech.net/d/files/bizoziwunumelizibojonizo.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/7259215254.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3af3641e47bcb84c0d8b33655c409968/nobixuzojotaz.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/buvitofupavodezoxared.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/65924330627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=swagelok+needle+valve+catalog+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_off0000bfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C7 17164 bytes
SHA-256: 3a45c769447b7e2fb41dfb08c1ab896a03495d70d7db75272afda64261a95a60
font_02_sfnt_off00010490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10490 10752 bytes
SHA-256: e32016bcd5437189c8c8b3b9a2e334733a0b2e0120f148e9f4cf2b6b143534db