Malicious PDF — malware analysis report

Static analysis result for SHA-256 9edcb70c3e881c15…

MALICIOUS

PDF

82.4 KB Created: 2021-08-21 07:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a817c8120f283635eb3b88041b960d07 SHA-1: b29e623c5f2960d91731b5a7ab542375da368b9c SHA-256: 9edcb70c3e881c15e7f32086affc6e59524734325c3bbbc9c64ce9d815bc93d2
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. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to further stages of a phishing or malware distribution campaign.

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://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/0179acc9226652a3868ab5f55e506b73/93731824489.pdf In PDF document text
    • http://mamtomchabahai.com/uploads/files/files/japakevina.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/0jlaqkj06k2enh5nao5emlvvh9/66883456429.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/xarixegevituj.pdfIn PDF document text
    • http://mramus.com/fck/imagesfile/kofezow.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/k2jh1ucb9e78rh1f764madf44r/51681699185.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/5f3b32012b28d374e41544ed9c229d37/serawitivuwozirevabumi.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb4facf631---nanemawudibokirusodunato.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160953b8b37e75---sevavex.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6f2c7b8e47afb20211dedab27568cddb/78261542481.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/21280756621.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610037abd6efe---tejatekujujopenipujazaf.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/16461623996.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc29373f5e---59297444918.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/62997096287.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/56465801574.pdfIn PDF document text
    • https://crpm.ch/ck/ckfinder/userfiles/files/78443673595.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/88fsglp4ctulg0qhi25amkvis1/93803428918.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e72513c57---moxesirudot.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/nusowalono.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/14227592124.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/eoauvuvt3b48m3ak8cj8p1u2rb/bozijawelexalilusowo.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/b458127f9268f36f5bef6e9f617efdfe/witisasikosiliw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=free+fire+hack+download+apkpure+2020PDF 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_off0000dd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF519 16872 bytes
SHA-256: a455a87de1b0ee579f9a7cd7dfee6f2e8b69a5d01e37a1306a5d859e055da74c
font_02_sfnt_off000120db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DB 10948 bytes
SHA-256: 3be1129eceb3f1b518daa95173ee6b326d4950571f82bbffa081eb56a83356ab