Malicious PDF — malware analysis report

Static analysis result for SHA-256 041010f3229165e4…

MALICIOUS

PDF

82.7 KB Created: 2021-09-01 14:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 33463451e0e9a5665e3fc8785818c59a SHA-1: 8c2b5d12f86d3713e7d2944f8eddbc07076f2192 SHA-256: 041010f3229165e47bc60cbf77d664309187b5734893ece0d8d20a1909fcd233
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is unreadable, but the heuristic firings and numerous URLs point to a malicious link farm designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bjhtdszdh.com/v15/Upload/file/2021612152449544.pdf In PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/55899623226.pdfIn PDF document text
    • http://yjccnc.com/upload/files/92279550424.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/56332106594.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/dizug.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/sobivopojuvakunutitagided.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/1c5eaac74cd93ba7c7245248b5914def/92769232530.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/9c4c6e0768c5c3cfa2102179afce6195/lekidufofajozemafero.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/0feef3e0ed6781f166990e889656e819/lipudojoxexukukadogew.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/welewemesudoloj.pdfIn PDF document text
    • https://bamor.org/userfiles/file/14544004388.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/45649119525.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0d68ebbd11518f4ca79d1184e82bb587/20568600972.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed04d2b8c2---sabisizuwarowu.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/74672535074.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61771d658---89939595764.pdfIn PDF document text
    • http://lagrupacio.cat/file/37058122043.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/wekimowun.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/2c2cf627d0f1a11a0c19a60ababff9db/49768977500.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/toxazotab.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/wabiliminosifoxane.pdfIn PDF document text
    • https://magatek.com/documents/file/jawesipanavukukaliteva.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160986f00cb8e1---nikop.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/41781908255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=top+10+box+office+movies+2019PDF 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_off0000dc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC72 10864 bytes
SHA-256: 4ea65d0309d790eef5aa5c45c9cea05e2e0659c6fba9e68900dd763d386e8df8
font_01_sfnt_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 18376 bytes
SHA-256: 932811f0cfd06d741724b8f392789918c98b51c127ed83e4b9c151f5f8a83f6d
font_02_sfnt_off000124e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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