Malicious PDF — malware analysis report

Static analysis result for SHA-256 36bf50bdf23c0410…

MALICIOUS

PDF

85.1 KB Created: 2021-07-04 07:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 34154846367502ecc2f6d4ed721a03ce SHA-1: 858398385a86ff281518ddc7e287e058142407c8 SHA-256: 36bf50bdf23c0410e18c094f694df51a0aceae32fa337d25559d998415627541
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, distributing links across numerous compromised websites and disposable hosting domains. The embedded URLs, such as 'https://nomylo.ru/uplcv?utm_term=beetv+for+ios+download', likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=beetv+for+ios+download PDF link annotation
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/rj80ukvfgv8ruh7pgjtuhlfof4/bipokedakirivofinu.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/domiwirax.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608999c375194---86742568044.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/bvksvmfcfilclqa6lgfl47ccbk/26803017569.pdfIn PDF document text
    • http://short-story.ru/upload/file/kuvanejotep.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/igod3hqqun2or3g7s63e8a0noj/42598244514.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/60681023823.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2484bed564---siferibimilukif.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/4738644326.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfad726dbd3---vodopivigafelezitadu.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/69689ad02178de5ca7e1d30a5fe76af4/4846950310.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085064263382---furosapiguxesa.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/77280745603.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/9i22172tm1mssiphg8utqpk17m/puzirel.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/8nk44uij2o3b9hel9jemncmkr6/9022378199.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/62649747274.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/89fc7849d51f7ff74afa571bac881eb6/38676964833.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/87d797e72b3c51a5e4a96f552ac510d0/fapagedim.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///72892853773.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/femijesoxotipevel.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7c9a1da91---nukefumalipomejozajij.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a0469a1fb---bafaribazozobelunekase.pdfIn PDF document text
    • https://maintogelonline2.org/contents//files/vazonebisenifaluxerelepe.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/5b41011ea1b0ad8e7676ff7cd82bf1ff/xamunajetupun.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_off0000eb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB63 10552 bytes
SHA-256: 32fa7532bd12785fef17111de28cfc409f817bbce26298c63235f7fe4e82137d
font_01_sfnt_off000103af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AF 16920 bytes
SHA-256: 3e10b159c9db2a7440be47bd26c0ee50a037585a57156d1441280a6117ddd512
font_02_sfnt_off00012f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1