Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4adb0b0f14d24b…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 19:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5ebd9097623a210499cbc7797eeeafa7 SHA-1: d61da36e174ccbda14e5880b548d22931e1f2e25 SHA-256: af4adb0b0f14d24b75c27a47c22b27a32d5c3d95bef5cb22976728bbc5da40b0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, including one hosted on a compromised WordPress site. The presence of numerous links on disposable hosting and a UTM term redirector suggests an attempt to obscure the final malicious destination, likely for phishing or malware distribution.

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://garglob.ru/uplcv?utm_term=master+reset+code+for+android PDF link annotation
    • https://yptea.com/data/fckeditor/files/revebopekitafodarud.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/25747207793.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/najavakakesuwasuwoki.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/32936612963.pdfIn PDF document text
    • http://beta-rc.com/upload/files/65957152589.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/48857308935.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/pubesujipuvok.pdfIn PDF document text
    • http://vanhacollection.com/images/files/pokoxatuxokavufojewasedu.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3743866f9---wekazilawinopawevotesimev.pdfIn PDF document text
    • http://velisend.ru/photos/file/kewotifujulag.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/58661227700.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/66556713353.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/79664536500.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/mutoterosogowigigamat.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/53738295563.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/93247625896.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149c19b6977e---vefolibuw.pdfIn PDF document text
    • http://zaiger.ru/img/file/32469280927.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/sakupawawexenawotiboru.pdfIn PDF document text
    • https://renewone.de/files/libabigepozegivologadoxu.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd52a01182---kinanemoxinubaze.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nusoratakiborikedili.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/89111909560.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/bodejufawo.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_off0000b047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB047 10416 bytes
SHA-256: 3897fcfd60f5c40ba82644d1ebef6a9be582265ff6aebece9a444c53bb6cfc76
font_01_sfnt_off0000c809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01B 15980 bytes
SHA-256: 80914c1d08af86749746935c3cc865fc82a157324b8e0d1ddd49a2e0c06022fe