Malicious PDF — malware analysis report

Static analysis result for SHA-256 388e5ff3a9733b3a…

MALICIOUS

PDF

173.9 KB Created: 2021-06-14 09:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: dd697ec836125d2a83a854602bfce472 SHA-1: 2b6a9a5ee33bbae2fe186e583504d4c26b5f21fd SHA-256: 388e5ff3a9733b3a661c7ae729459219af448565a8f76c2dc20e78ec00d3cd18
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which point to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains text suggesting it's a lure related to 'Ruined king ps4', likely to trick users into visiting malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=ruined+king+ps4 PDF link annotation
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed7f184512---40541458887.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/17285688654.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/imfmbedhmt3bfc8fplgbslighv/44656386062.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/p3dq32uh2p6uhfe6v1681f6o9l/94611261541.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe2f5cf545---65341239727.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/3299ef7c0b8951851cfb5aec6590d824/pozelefepanavoxazuxopej.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764ff07268a---jipuvodaxitokomegavovewu.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/pepom.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/62073354325.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/da364d77cbb78f7c6579902253dd8234/ziguzoseboxunol.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160976cba7e76f---roteviviruxiw.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/616180448d871ec2aa0493911c14202f/85159819188.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/3n97du3socafeg5dh5nuek53va/jorozumumigumiwakuzenuv.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071885d9b757---62125206563.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/fd40ee9f03e2b86279356e13bbc82404/tuzasadevesadezetofujuf.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b761a3f0afe---62411221758.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/65454038461.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 115196 bytes
SHA-256: 5ee4e3a0329690747f6034d2cb9773b2a4365f0b5cf7a603cee38275b2aab825
font_01_sfnt_off00024ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24AD2 4948 bytes
SHA-256: ee1742fb27eae3d28fa8ddafb2c6f7289713cf205a6313ce670776d11049da2e
font_02_sfnt_off00025bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25BCC 2332 bytes
SHA-256: f8a781ebfd592b9290257ae78e7da18348b5939b6c25cde6f3e73f55edf4537f
font_03_sfnt_off00026634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26634 11920 bytes
SHA-256: f4da0fc6809c4d6f5722141e3a1859de840612ed332b3c30cf984e861b441c93
font_04_sfnt_off00028e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28E34 17172 bytes
SHA-256: 8cd192394e047e4adc77db027e2e2b7e545c0ea60f5130d177fc5ce8e23a98e7

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