Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d48e034b31b459…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 02:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1d6fbc4608685c534e8137db2cba17d8 SHA-1: f45feb96d8f007d27dfc1f46f03410348aa384c3 SHA-256: 25d48e034b31b459289037edc186d934a832b307f53f4a8ca464febcb01d4079
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate an attempt to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=parallel+space+32+bit+support+apk+download PDF link annotation
    • http://dietetyka-24.pl/images/files/91356701719.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab644bac3---vobinizabinokekelabetu.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161433e7b7a3d1---74747942293.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/82725748520.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/52203823340.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/gusifesurawidepigesusasun.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/13528962419.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/netokovikokowufatixalowo.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/45151317052.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/28068507870.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/zixelozaxabikumi.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/73416172833.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/fetin.pdfIn PDF document text
    • https://pindimana.in/uploads/file/tuwebuka.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/wokinevav.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/47391767592.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/tuwinulotepi.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/fifolexefamiladawadiki.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358fa3c8ca7---17049970403.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109131920205041.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/13936464708.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/xitexa.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_off0000ce46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 11216 bytes
SHA-256: e4db9b1303a12a727b0e354dba622deaf98d5c0dd1c8bd54d01e86ce61bad5b2
font_02_sfnt_off000100b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B0 18420 bytes
SHA-256: a99a83e19f250f06806c1ba6ba18adbaf22b3c148ab4815ef1970e37cb6c9bcb