Malicious PDF — malware analysis report

Static analysis result for SHA-256 b631a437268a2f03…

MALICIOUS

PDF

87.5 KB Created: 2021-09-09 03:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ec058d7af38effc7a46fe0313e359b98 SHA-1: a653a66b609fcdd1d9229c7f27771d650d3c1d58 SHA-256: b631a437268a2f036dd9b82aaccef71e28325b221322c5b49301195339116734
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users into clicking malicious links. The presence of embedded URLs and the overall structure suggest an attempt to deliver a phishing payload or redirect to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=how+to+delete+cookies+from+my+android+phone PDF link annotation
    • http://asesoriazabalburu.org/azaba/files/file/82739708459.pdfIn PDF document text
    • http://scsychem.com/upload/files/63009837957.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/fuwilazu.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/91560046620.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131d717a9bc9---60450239949.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/49683926287.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/darikatevexosup.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/12833582034.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/wikudanugubisa.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/50827339803.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/vivolomulubipazopevu.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210909_052828.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/mubunajulajisowete.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/83753971707.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/wamidutu.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/zipovodutupolixokalodene.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/nibilizilotimokuw.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/86dd3eaf0bf4ede3f1c746b68fc45584/lakawifuworezisoka.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/14193640555.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/dekixisonurovejimul.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135333acbd75---39187153680.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fda0aae965---22298613545.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/ragidimutazalexijexo.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_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E6 17620 bytes
SHA-256: a0d8efc4697dfade8d9750147361acc02397327f01cf7c81cca655854aa1bce3
font_02_sfnt_off000135fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FE 11168 bytes
SHA-256: 456cd1ee187570c5fc5cb8bbac7c9f1455b95c808e0c7bbc03e67769215f2148

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