Malicious PDF — malware analysis report

Static analysis result for SHA-256 28006193da16d038…

MALICIOUS

PDF

89.5 KB Created: 2021-10-10 23:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 90c89a881ba1366541820996d559f513 SHA-1: 18a6a0b3a6fcd2f63ae0b14c52fa7c215ddc8631 SHA-256: 28006193da16d03846aff2bfd6d1474924b5d05c7857011d29b71397b27b537e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to various domains, likely intended to redirect users to malicious content or phishing pages. The presence of embedded URLs and the nature of the heuristics suggest an attempt to exploit users through deceptive links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://infrive.ru/uplcv?utm_term=how+to+say+tape+in+spanish PDF link annotation
    • https://xenang-mitsubishi.com/fckupload/file/gevetifo.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/78244662809.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20211002_F13D19DD2FB972C0.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/noxujaxepezax.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/82723050584.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/vakisosakasugisopakafa.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/womurokepinim.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/gugevosoxiredovusegij.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/lidikafoselegubudimitum.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152a1732bd6c---37636808013.pdfIn PDF document text
    • https://konferencia2014.medius.sk/userfiles/file/ravomokezoz.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/65254226510.pdfIn PDF document text
    • https://produse-zilan.ro/files/golodagapibamisexutev.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/9fb4123c32ed5f0ffd9ccad6a79527fe/90329433952.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/pukopixoxukaset.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/40091298930.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/dakanowinurer.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/9081925310.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/191aeb508792d7d35e7e1f4946d929aa/54093089509.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/95580722424.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210907131947_692eej.pdfIn PDF document text
    • https://zzwgjx.com/d/files/mopivupevakebobaxotoruwuz.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/wojowabukixivagalob.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/27951442720.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/bimikababi.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-12/20210912033253792264.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/83012122937.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69B 10396 bytes
SHA-256: 5832aee4c2ef54d5ad0367f9cfd290b0f15d10464fdf8472945072d88f2d7926
font_01_sfnt_off00010e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1B 19444 bytes
SHA-256: 988411324960ac754922db13b750779f8ace502a3e8bf088e0d7356f4aad7c4d
font_02_sfnt_off00013fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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