Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3bf4f889ccd516…

MALICIOUS

PDF

78.2 KB Created: 2021-09-10 16:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 65934ccc3872d00104b8e60da06852f5 SHA-1: 5aa699627d0cbd85b617621c77c6290597594026 SHA-256: 4d3bf4f889ccd51681a84be3d4341d42078e5ff19f1a04f8162ba06c1fc76619
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external PDF files hosted on various websites, some of which appear to be compromised CMS uploads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://szerecsen.hu/editor_up/milevowozowiruso.pdf In PDF document text
    • https://losaltos.com/wysiwygfiles/file/43586593894.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210905_374CCF2604CF40A9.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/pivemipalapolaladapeta.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/dutemexu.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/77023113332.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390081979d3---jisifodene.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/85318267980.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/xulisuxezugetisa.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/40761396685.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/a1kl0ohh0d4o9k6s7rsgk7d7da/keduxegiz.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/jiladexoneponup.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/35023768117.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/dutopuxumukid.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/2cd9602e9e2724d8ba4cfc91449ef350/makonag.pdfIn PDF document text
    • https://simorgh.it/uploads/file/44374053490.pdfIn PDF document text
    • http://vce34.ru/attachments/file/zuwujom.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/86103316191.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/vonelajefegumuladikemupap.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/8741702641.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/48532657137.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/55953473521.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/62364761742.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/7c752eac943f1ff6d0530ed842e1b82f/87586299436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=y8com+2+playerPDF 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_off0000d15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15D 10500 bytes
SHA-256: 09b76e9b380c6899de7a6bb834ebf6dca884be70a8d99709043ffff3cf59ab48
font_01_sfnt_off0000e958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE958 16488 bytes
SHA-256: 627765d82604fdf71fcf116809a69cc42844ea0988db28a757b6625664581035
font_02_sfnt_off00011403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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