Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76a96492c84dd8c…

MALICIOUS

PDF

85.2 KB Created: 2021-09-17 15:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 25511a4936d26828a2a3d132aea7f335 SHA-1: f197fff374862d56f392a5fe09fb8e7ab41feb05 SHA-256: c76a96492c84dd8c57305f60540f02a8adad1ba334e6597e71a0c1ac48e314bc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and a link farm on disposable hosting points to an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ketchas.ru/uplcv?utm_term=how+to+find+your+lost+android+phone+when+it%27s+off PDF link annotation
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141130633b95---90350899251.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/vutivon.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/35014625479.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/72535432620.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/mubajudabajukomafowaj.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/goluzovibor.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/vojivokogegud.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/podoliw.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f39094da22---fefebemikatugoworob.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210912_5E2D287AE5688C1D.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/debefogudurimuwasirubawa.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210911_062214.pdfPDF link annotation
    • http://euroear.eu/ckfinder/userfiles/files/84750107402.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf135a463---665805171.pdfIn PDF document text
    • http://megalaserasia.com/upload///86551064437.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/41554047422.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/xewowunor.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b6c1b4b997a0b02158a392bb7d0d16d4/popusuwugupiwuda.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/afd247b6ac5d0e5919782981e40023de/tagudomenajanex.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/avv9b1m43n7a732fnup3f7ii88/35109424902.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/tizuxonafixezogiw.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/10669486878.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/13508337764.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_off0000e73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF54 10920 bytes
SHA-256: 97bcb5785e54311bc0cd2bd52d01b840a9e5fd9b947a69f0b8b596dd9e48dcf6
font_02_sfnt_off0001189e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189E 17620 bytes
SHA-256: 485e26f39175e3a5c71e60ef4ab749ee4c6fe28fe2e9cb3b416d92e960fae039

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