Malicious PDF — malware analysis report

Static analysis result for SHA-256 106b12c3eee5e3aa…

MALICIOUS

PDF

86.9 KB Created: 2021-09-04 05:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cf3d592442c06eeaa69a5c6dc42ea4c9 SHA-1: 3886daf74ef1e61929e9062e464391917c8b4cd5 SHA-256: 106b12c3eee5e3aa06d6567887f745958dec2005f95efc1b42bb4add74066343
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 ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised websites. These links are likely intended to lure users into downloading further malicious content or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://boathousebrokerage.com/userfiles/file/rapozidetevugavale.pdf In PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/2b3ee817edfce192065eb55df5f3a36e/jabukibowisot.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/bizuvovi.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/zifodojifeliz.pdfIn PDF document text
    • http://expresskaliski.info/file/donadozaxapefatapeteniva.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/3278315726.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/1fe972a2bea6429be16480130344bcc9/rixag.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607802510b310---gobekefogadatari.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072b9fc0707c---vetotasupimokibepunuj.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec28b4d6bb---vususitule.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/zifefe.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/84816627963.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/4aga56vkbt4ek7d7pke4b9dab5/kurobukadidiwazodozezu.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/2845505003.pdfIn PDF document text
    • https://mahae.hu/files/files/mamefef.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/99101769360.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d73ae73c8d6---66205951534.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/guruw.pdfIn PDF document text
    • https://artbynela.com/uploads/file/40842589774.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/xusaborifopenud.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/kasiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=strawberry+perl+install+module+manuallyPDF 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_off0000ec2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2E 18144 bytes
SHA-256: a1cf61b4df657f59cc4f80bd6aefb9450d6795e3785c8dbc0c2c2e2b302989c5
font_01_sfnt_off00011c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001342a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342A 11068 bytes
SHA-256: 9e7ec884393fc6942385c4979a69cc915b535980e39fe8a48dbb2d6a051bb0cd