Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b2d342771a83cb…

MALICIOUS

PDF

89.1 KB Created: 2021-06-17 19:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1ddb303811b63eddfd9f1d3cc230e2dc SHA-1: 066a0e9b4c04922cc37350bf6170744efd9ce34a SHA-256: a6b2d342771a83cb7f023eb6b93fc035fe3b4386365989661dda5ace81d00a34
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress sites, likely intended to lure users to phishing pages or download further malware. The presence of multiple links on disposable hosting and the use of UTM parameters suggest a coordinated effort for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddb06c677f---91587201830.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ukpghlqc8rok6goi0nlm7cei8c/pakudiwakotup.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7e3ca5823---35963938740.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/vowuzexi.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/d4835ce630d2d0f5443a37180d24cf3b/24443915490.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a82177646be---belitigopenejojixapaza.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/25349751254.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/77040102142.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f656cfc2e---57985042966.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/47817440128.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/abc63447bc96253514ae01ae5ea75b53/453624067.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092dabbe550b---82949065409.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210609070657.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bda6ef28276---tozigu.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/ce0e2c6f267bd72f90a01b69c143699d/wexujupoxonaluwimof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=luna%2527s+fate+cheatPDF 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD923 6568 bytes
SHA-256: f1bdafbd580f333fec724c6c472fa428f11528df848eb590c8508f49ed81df4b
font_01_sfnt_off0000e93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93F 2952 bytes
SHA-256: 18f3dad90f0b8a749557125039a501166b605b51d41492c5c2dfd7e147c8bf53
font_02_sfnt_off0000f3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CE 4816 bytes
SHA-256: 4a5bc35ce42b3f67d3b20628500f37c12fbdb200f350f7f9b148941b356b219e
font_03_sfnt_off00010441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10441 9872 bytes
SHA-256: a112350b40a60e7db78e2d9c3d6c3cd858d2d39f4ede8c9e6d2801970e6593ed
font_04_sfnt_off0001174a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174A 12260 bytes
SHA-256: 5e180bedefa7c26a05b3bcf4bd41d95bc0a5b43e3d053913e55a3b9025f59042
font_05_sfnt_off00014020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14020 16264 bytes
SHA-256: ed7d226c68b9ad52ab8d655bef924bfad07b269590c2261b79670532bff8b6ff

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