Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d23249d7bc0940b…

MALICIOUS

PDF

98.8 KB Created: 2021-08-08 02:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02a2360494427112281f0c353e15dd2d SHA-1: 531bd14ec1fe785df17fbffb305c1fa4241de878 SHA-256: 2d23249d7bc0940b0576a1632092851faaea2db0169697c860d0efe3663e6802
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs that function as a link farm, directing users to external sites. Several of these URLs point to compromised WordPress installations, indicating a potential distribution point for malicious content or phishing lures. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://irlanc.ru/uplcv?utm_term=epidemiologia+teoria+e+pr%C3%A1tica+mauricio+gomes+pereira+pdf+download PDF link annotation
    • https://avonsteel.com/UserFiles/file/tisuguf.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9fb6c3841---divegarepagulolekize.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/nigijasoto.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/e1b4888bf714122b99091992c0488434/44318983890.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/rutipepudegaxaxisago.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/fowawexokujut.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210507070217161.pdfIn PDF document text
    • https://vpmemorial.net/images/file/30435840792.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58201504581.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/5d060e56e3f84bd695fc03252cc23ece/35492332825.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/pesijazezarogakutemoxabe.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/86219988471.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/aa27494f11b4408467cfd522ed5fbaca/gibanimijud.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a04816c8c10---duros.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd29e5d9ab---75924915530.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/verumaregunitesuxonono.pdfIn PDF document text
    • http://mobiliteit.nu/files/95381415267.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/c426be1a36d2b8065c3032c740b22338/61868056636.pdfIn PDF document text
    • http://simonide.org/userfiles/file/43802292223.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/cmot8ifhp1qljvaev2qal4cu95/40382314784.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/45737123426.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/5dmh4vat08f377fokneat72aln/51396521440.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/11145236359.pdfIn PDF document text
    • 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_off0001141f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C36 11312 bytes
SHA-256: 79ca9055d9b29de34264b005d5d644ec78566fdaa25a7f2103599fe8f9160b41
font_02_sfnt_off0001463b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463B 21248 bytes
SHA-256: 6158a8b0ea0008c235ab8c75631e8b1a8d4253425b64fe56481385355a279d75

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