Malicious PDF — malware analysis report

Static analysis result for SHA-256 975850a1c206911f…

MALICIOUS

PDF

87.3 KB Created: 2021-09-16 10:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 68c55d43cc0da39f71f089566de6ee1b SHA-1: 7d068748c88983f948d8d4a667f082de2a415f6a SHA-256: 975850a1c206911fdcbf6a4f494f856055019ee0c02b4d535278b4b9ebaf0541
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of JavaScript suggests it may be used to obfuscate the redirection or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://crysiq.ru/uplcv?utm_term=setup+mi+box PDF link annotation
    • http://yejiya.com/userfiles/file/kirigasepikatoribinu.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210911171006.pdfIn PDF document text
    • http://apple888.vn/luutru/files/napodasaviwuzenuduxibonis.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/42695989165.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/ae8f5b70196d194ff38d456c0f320a05/73839490257.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/57860466841.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/liboluvanopo.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/80915092012.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/47582513602.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/74981035481.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67629115564.pdfIn PDF document text
    • https://bloomeng.com/uploads/32095301289.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/58633226651.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/69564525488.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad1fed293f---53505329342.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354bdc27854---wolugisazito.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/85427877262.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/vidujezev.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/71845152291.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/73014460634.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC509 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1B 23564 bytes
SHA-256: 36a084280eab58740cf9719e5b319037584a5ffee3b7822cabebe1c395e73c6a
font_02_sfnt_off0001181c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181C 16516 bytes
SHA-256: 0205ec7c75ca6bd4a1a8e5eb09a50630b8dcb7fc66d42208070b36220f99f50e
font_03_sfnt_off00012f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F50 10252 bytes
SHA-256: 375e349686911612a69bc6d531e1036e381f46c64c33f392466896b964df0397
font_04_sfnt_off00014627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14627 1924 bytes
SHA-256: b3c88c1e19850007cfb8aeb5473549a66b9fc136d23d75e8b3bd398b023e3081

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