Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa05fd2e72bb215c…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 05:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1cf9864f3edfd8b7fe81cd2d8b2cb057 SHA-1: bca9fb8eab6bc395533b97349f6de8cea109d4aa SHA-256: aa05fd2e72bb215c0a7f15b5a9a093f9dc28f8b2a60ebaeb45588d029c596c7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript, while not directly analyzed for specific actions due to its nature, is a common vector for further exploitation in PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pmcp-avac.com/files/upload-ckfinder/files/94461140683.pdf In PDF document text
    • http://izmirtavla.com/upload/file/zujudosudenugibes.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/kefitamedixidebugakiwavaz.pdfIn PDF document text
    • http://esejsc.com/upload/files/65073366729.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d1cd7a2ea---dalanewasuwis.pdfIn PDF document text
    • http://xtra360.net/campannas/file/ditanizukuje.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/poxazati.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/68662698962.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/82161138763.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/ligogile.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/32683761850.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b31edb5b8---37597492781.pdfIn PDF document text
    • http://koutingchina.com/upload/files/10427544414.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/dituwigejamipi.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/59948056064.pdfIn PDF document text
    • https://sergiomauri.com/images/file/82958843064.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614127e1789ce---2656795926.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/85080577596.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/ziwomabukimoma.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/zunomixojezilofaxunarize.pdfIn PDF document text
    • http://yuli-china.ru/d/files/74776117787.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/jeniwavepipesixalefutab.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/42908887971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=strategic+integrated+marketing+communications+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_off0000e0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D8 16576 bytes
SHA-256: bcbff539219342fdc9950013c40a78e176ee8b512fcd196192c397bd37da6437
font_01_sfnt_off00010b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B56 11184 bytes
SHA-256: 342151be9274ba9c1d40f2a5b251587eeb2c85bb7b26d8bfe89b34e486e77e2a
font_02_sfnt_off0001254c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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