Malicious PDF — malware analysis report

Static analysis result for SHA-256 1087022d13267f07…

MALICIOUS

PDF

95.9 KB Created: 2021-07-24 16:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5290929072cf246e8934903013b73c73 SHA-1: 3485b7547645db1e2fd5f24d08f8103f5c47f8a0 SHA-256: 1087022d13267f07e98180e15f547e8a060f5d73cf687e991e688fc495ea55ee
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress upload directories or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings confirm the presence of a link farm designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://yangpupark.com/uploadfile/files/41381911976.pdf In PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f73a8e09b---13491389951.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/74031604332.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b25055ecff5---86001865917.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/gosaxofulujakugef.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/xupum.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c41b02721---zerozuduzunin.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160d813555034a---40248487914.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/5fedbb4eaa1a7f63c5704ca3689581a1/32329733063.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/0jaca4nhdc4umf964q3hdboh8g/48690943086.pdfIn PDF document text
    • https://arabacioyunlar.com/calisma2/files/uploads/70524453196.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2a02eaf07---dorogaxoxezurogeliwebedaz.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/8ea8a8618ea89558ebc2280f7d947494/vilefimupaver.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/4novhr5a4l0ricrjm3f0jc2cn7/vabamukijevixugedoba.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607795ca98a8e---goninafo.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/gobelosexudopububewow.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/52983182406.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f1e4586fee0---matudivubokexivoxinewepog.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/20cb8f5c063031f328d7d536e55977a6/32988868299.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021070605321735.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/m28e1ic6jf9pfb6brv7ndsht8p/tobomolubezezagevitepik.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/patakebebenume.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/607f973f0ad9f3b38f1ccc02e4aa6d4b/67356538497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=introductory+chemistry+for+today+8th+edition+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_off00011032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11032 11212 bytes
SHA-256: bd776eb36f9353a3ccb04af657dadb81b181d4491b49d61c21d63a0466e993dd
font_01_sfnt_off00012a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14267 17600 bytes
SHA-256: 8a25bf29d0e7e2b714adcb5c9c0c81ace5b54e7c01023844f83e55f395b5df97

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