Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e909de65897bdd0…

MALICIOUS

PDF

83.4 KB Created: 2021-08-26 10:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 700f65eed5065692f56db630650ad634 SHA-1: 22522ae575cdcf8656576dc936ab0e360b4be771 SHA-256: 4e909de65897bdd00a7b9123b96ca032c93c3430a206b44115987ec7aac9ceb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating it likely exploits a vulnerability to execute code. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms, suggesting a phishing or redirection scheme. The presence of multiple external URIs and a link farm structure points towards an attempt to lead the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://santehsevast.ru/userfiles/files/gapuxu.pdf In PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/c5826a525e030d5c46394f33149e9455/35650394778.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607463608ebbb---74962657446.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210708_0B374B0016B278B2.pdfIn PDF document text
    • http://chayka-svg.ru/files/50931275125.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/56303374743.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975b8ba51c4---52490125060.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608498003fd5b---60694564038.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/97758842678.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/i88n0pgp1l8vnfd2aibsej3io4/3176726481.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/vjf54ciu1jpq8qdmhtd3jvv02b/gejalozopedisabewosunejo.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082738254f8f---lukavaruvasalogadisulaxij.pdfIn PDF document text
    • http://clarasonic.com/upload/file/94602876148.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-20/20210520061434567842.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/74752581164.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/petalojefodokusomumo.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/16588233621.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/9038657a9c08e1c449a2e9c2f8ea53ab/tosexobuxuvokukaxaga.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bf7ad6b50---96954137179.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5c8360ced---27421069942.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/7qqr4u04fa83br0gmjo6gf7doe/ravoxiz.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/80721467616.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160886f8bb530b---83258212504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=lord+of+the+rings+meals+quotePDF 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_off0000e28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28F 16912 bytes
SHA-256: f1731afc29fbe0fff1a4b142d0caf34d19957e9b2b0cfc80ecb87da862de037a
font_01_sfnt_off00010ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BA 11004 bytes
SHA-256: 945bd2069bef88f95958705db294dcdfe5c112279f1dc345deb4f78fdcf2918b

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