Malicious PDF — malware analysis report

Static analysis result for SHA-256 edcab0b5527d7e95…

MALICIOUS

PDF

95.6 KB Created: 2021-06-26 18:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ba7268d788781abcac0bce847c4d9631 SHA-1: e3d5e5785a8a350fd569bcb7ed9f3f516330f191 SHA-256: edcab0b5527d7e95dd41d50770e34fe51d5cb4cfd2d04d96fbb41780195aaa8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to distribute malicious content or lead to phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of external URIs and compromised CMS uploads points to a common technique for distributing second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://chcial.ru/uplcv?utm_term=ananta+beast+tribe+quests PDF link annotation
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ee78e86473283f45f493dca5f5c2d8f1/94077388501.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/cbeef151b14d6a616cf826f3ecc4b7a5/85973521718.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/42145256978.pdfIn PDF document text
    • http://talleresjpg.es/img/file/81502798954.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68eb7f07a5---kemirejetewedononajox.pdfIn PDF document text
    • http://ubest.ru/images/file/bipurolenitabube.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/664255172.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/9ed736bad424cbbbcf8fb321ea39a4a1/16732888681.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908d8a26560---48059955620.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088a01f06837---xopixapamo.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/8020727f8318086e0f81fe66dad3cf96/falelafisarevipugexejiw.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/18154227589.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf440c17ed9---27184407258.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/likiwetebamaguzabu.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/vuselumunuleriga.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/75763667362.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/mfvqc0121hgri8v0ah2o5vktpq/89106384875.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/ropojoto.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/eco4l34evlt7dfddaprtoc4al1/51636566707.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/46484316479.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16089cbff6b183---60642980219.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/timume.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d3d2755f5---jonipovikexutajigisanela.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_off00011485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C97 17344 bytes
SHA-256: 8b74d49d7e57e2c4dbd877a027c64c989fc0b43bf1c7705c9db3c69c5c4ef674
font_02_sfnt_off000159a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159A4 10300 bytes
SHA-256: 5b853c0eb5d5d4b0be27944aac7dc048b361546ecdbf05304a54c425870d432d

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