Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fbb7cbcc147780…

MALICIOUS

PDF

78.4 KB Created: 2021-09-16 01:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3416289f84d789185534bceb4b9f2692 SHA-1: 3d28e00f83e54fe6188de9bd1e2ec3b0f78742d7 SHA-256: c5fbb7cbcc147780755efbf99f9fc3dade5e8a1c65108a4610aaadc41d48d00b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised CMS platforms or disposable domains, designed to redirect users to potentially malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a vehicle for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/gufolanujo.pdf In PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/13213189437.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090914442623.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/55805703680.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/40998239843.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/46025076901.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/69561658628.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/jagovomijexinuvibijovu.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/98384794186.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/wavodokezejiwa.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/54689270415.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/lajezulajozita.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4c719b60d---54851600450.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138689347bde---tapobofiliw.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/lorivofoderuwoxetatimerab.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137b6fe570a6---41004399825.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/vatinarotixuram.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/javogeju.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/e3f674548d5edd3fe12afed3a9809005/64417951204.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/zosejaturojigetirazumisek.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/rumizosamezizew.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/22442369946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+stop+unwanted+adverts+on+my+phonePDF 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_off0000cce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE0 10876 bytes
SHA-256: eb845513a4aba0d2d2e7ff44aa24bad1ce0179132127d8c9d0c11f5042b816cd
font_01_sfnt_off0000e5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF8 17972 bytes
SHA-256: 5eb0f6524e71c45def74acab1962b66f690917526b17d78fc28eebebae1e77da

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