Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad6ad4906a0b10d…

MALICIOUS

PDF

92.4 KB Created: 2021-06-26 04:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 672b4fdf417b790615b1863039579bf9 SHA-1: 96e08b4590b221593a412eff4285b8b1e0e93ab6 SHA-256: 1ad6ad4906a0b10d1851c8f375d62bb4602a9eba43d848db9f844b8dbec7993d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://coretry.ru/uplcv?utm_term=something+wicked+this+way+comes+full+movie
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/ae45f2e3a5b934f6a358eee4d51494ce/44998767103.pdf
    • https://htchninc.com/d/files/15744555252.pdf
    • https://cuacuonbentre.com/upload/files/13688974991.pdf
    • http://apsons.eu/files/file/jopepaxunefiso.pdf
    • http://www.peretprod.ro/content-images/file/vejiwure.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3dc60131c---74717941330.pdf
    • http://funperm.ru/content/file/14714181271.pdf
    • https://ecoretras.com/file/detebumebudifufezaxe.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099040078016---werusuxudepirugomope.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/doduvatuduri.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080103650969---98502073356.pdf
    • http://anbao.vn/uploads/userfiles/file/36284703737.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac911d1a054---rojetumelep.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/029c0526c8c197f98f0e9ab249690ebe/29827470703.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090913625b84---xogepemajisusumuwagevonug.pdf
    • http://saharun.org/uploads/ckfinder/userfiles/files/84509899824.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742b386a1ad---28426553014.pdf
    • http://kursadowicz.pl/Upload/file/tofevovogusomum.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607c711ed3775---39727229063.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7c9ce70fb---43023394189.pdf
    • http://modnyi-buket.ru/uploads/files/vulaken.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001018e.bin
8a5b8762b16fb1b3a1393227a4c02855ee852e897a49e0f882fbc82564b96ede
pdf-font-stream PDF embedded font (sfnt) at offset 0x1018E 11356 bytes
font_01_sfnt_off00011bfd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFD 16792 bytes
font_02_sfnt_off0001340f.bin
5ef033a2b8d1e26fdc5b8cfdd5bd94e9d7342fc9bd834777988e52fecd4de381
pdf-font-stream PDF embedded font (sfnt) at offset 0x1340F 17668 bytes