Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15202b150a8be96…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 02:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7f1a5348573451a278f7438dd32b1530 SHA-1: 6bf29591224a9b1cfc1c7e50287b26f3a55492d0 SHA-256: a15202b150a8be96eca546c3cf4f38834b38e11ddb3cb28f741322470f2d96f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised or disposable domains. The presence of numerous PDF links and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results or direct users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://mdknoodles.co/uploads/files/97370083178.pdf In PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/0b84ed850c143fdcc34126942b28c237/dixosivaje.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9922ed0cb1ac7680ea40ccfe42ae1ec0/xawuzosorirowe.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/refozupujadumewe.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/tasidatotuwoliki.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2699a6087f49eeae739b016e7e4cd567/80818893821.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/lgl839ca61v6q8ddrmjms9l9n1/wusolovakofaz.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/xijuxi.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/wapufubowaxofez.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e05ca69b32---mapofufipatoxomon.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/71453189875.pdfIn PDF document text
    • http://weingut-suppan.at/files/vozupotodegamimusegorilaf.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/dokitisirizututomex.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a713664cd---89733113562.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/75020803152.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/guropeterisezug.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/nazar.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/remonudiberowigamimusujoj.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a93489a604f---xazokabisojijarogokul.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/kp332ecqpvkpe084d93uquf7v6/vokixixidewelepov.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/52297138798.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160bef6173db32---35299057828.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/37690278793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=financial+management+theory+and+practice+prasanna+chandra+pdfPDF 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
    • 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_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 11160 bytes
SHA-256: bdba0c8281cd7e4575bd1a32854c0accff4077cd3a7fd1355ea055879c07dece
font_01_sfnt_off0000f0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EC 17016 bytes
SHA-256: 37568b5cd13e2b7f85fe0496f00d813100d47a4495434eae286d4e43bf0a04f9

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