Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd211cdb286b5db…

MALICIOUS

PDF

107.4 KB Created: 2021-06-29 16:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b448ec44b9440b7f2d2d373982ebf82 SHA-1: 568ec677c7179d5279cc154b8db60ff6126d0bc6 SHA-256: 3fd211cdb286b5db3c7b5ca3fccbeb4f927e105f99fca7b59dfd9e0472db4d3f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories, likely intended to redirect users to malicious content or phishing sites. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d151ede138---66382733590.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ae8f41e39---84632469696.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/kl0gj10hi9mi4hg68sq758qj50/zakufe.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e0bf9f3fd---guvif.pdf
    • http://tubietelbar.hu/uploadfile/41412955759.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c34524cd6fe---27763935134.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d36d4a08bde---webikixatikitixagapino.pdf
    • http://www.anjhimayath.com/upload/file/6393700843.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/qgkj4nqkg4sag8doircs8h4cd6/18801672203.pdf
    • https://ludifrance.fr/userfiles/file/62161998488.pdf
    • http://techscreening.com/userfiles/files/77984142783.pdf
    • http://allprintusa.com/admin/images/file/51676656121.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/d1ee3f1d42b7ad99c5ab2b0dd39bb39a/66486283485.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d8c3326b0---78155147752.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/fapuralatavegewigiveteve.pdf
    • http://shinies.ru/img/lib/file/72988167995.pdf
    • https://espaciocultivarte.com/ckfinder/userfiles/files/vovasitupedowuwuvixeja.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/4ff3b0ffa535bbf4a772357aabd984c2/89172253025.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/491ac2b8f12a0adabe98bb0d9deb77d8/legerer.pdf
    • https://aradovan.com/userfiles/file/vezogedademuf.pdf
    • http://sys-svinding.dk/userfiles/file/lonuwinek.pdf
    • https://dm288.com/slicice/file/99741650766.pdf
    • https://stratasphere.online/userfiles/file/muzatonojek.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=find+all+real+zeros+of+the+polynomial+function+calculator
    • 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_off00013b52.bin
d896f548924bdb2e41d9b9b472daf818acbb800a4baec488d7f49a6e5a47eb3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B52 18908 bytes
font_01_sfnt_off00016db6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16DB6 16792 bytes
font_02_sfnt_off000185cd.bin
6bf236b0bc7f4a18207881994f3927ae2481f97b7ca321223d5169bf55ca3067
pdf-font-stream PDF embedded font (sfnt) at offset 0x185CD 11136 bytes