Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e86ddec319f2e8…

MALICIOUS

PDF

79.8 KB Created: 2021-09-21 14:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 52edbbdd99a253ffee1d64bc2cf6a9d3 SHA-1: 4b2c9e3ba915a7be4e279d9ea5afd186a0c72b05 SHA-256: f5e86ddec319f2e8257c25040fc287247787b05a203e71260a43b8b3d7a7fd14
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or redirection scheme. While no scripts were extracted, the presence of numerous external URLs and the 'link farm' nature of the PDF strongly suggest it's designed to lure users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/60858953747.pdf In PDF document text
    • https://sgcaregiver.org/contents/files/winuwutupojafetib.pdfIn PDF document text
    • http://grupophi.es/uploads/files/kajasek.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/1a1408702f246959295fd982718a160a/50905623843.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/dodakududizodorito.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/29561760091.pdfIn PDF document text
    • http://cudicio.it/images/file/vivumeran.pdfIn PDF document text
    • https://uudanbury.life/files/file/29871950305.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/82675633621.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/82207025139.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/gutumaxuzajagi.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/71717034613.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/19458166895.pdfIn PDF document text
    • http://mega.kz/media/upload/files/47514186772.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/94627066507.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/dipagizijusalefadaxegu.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210902071624_732721.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/79562567325.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/83199554210.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/94242209029.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hukl8q3npgsf9luom4971lurb6/39286434065.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/ganaxazevamogifo.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc46b5e66---45546190332.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613020ec89060---dibomijiwuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=best+mmo+androidPDF 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_off0000d3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B3 17936 bytes
SHA-256: a2078ef673adf8ba0621a34d4baad5d19591b491d57dd7de42f1b7ce6f43fb51
font_01_sfnt_off00010289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10289 10416 bytes
SHA-256: e24ec3c6c0c1aea2ebff4360e92ec03d3e7ba3b82d839133a2e783f2b6eaf174
font_02_sfnt_off00011a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1