Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b48bdcbb9a40801…

MALICIOUS

PDF

90.2 KB Created: 2021-07-05 04:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70c3366a9fc5dd47b01d63966c94550a SHA-1: 1dfb0012b124050c36ee7c50e026c1e80d43e312 SHA-256: 2b48bdcbb9a40801af7ee5eaf60da33ba8004b45ec19d97ccf0ec854e07e13b5
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories and utilize disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. No scripts were extracted, but the structure itself is designed to lure users through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/6i4brmgbd0vkuf7ga76vs5qk1u/87376074148.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b9ed2d0e3---82085326672.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c21752c0cc---posefenaxamisorufosomi.pdf
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/wuraxolepiv.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61e895aa1e---16431454809.pdf
    • https://mszukam.pl/dat//file/14154696928.pdf
    • https://mtcmultipack.com/uploads/files/ravafovezajusojore.pdf
    • https://babetravelling.com/ckfinder/userfiles2/files/derotodaxolon.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d37a45518---kuvutororab.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/16f3c41766f3ed66e3d28a2eac36df1b/92729325287.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/4e244a8882051a4edc794569150fe2a8/navedodexazilibewutu.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3cb27435d---jotadopijemovumizabag.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4c1aef39b---1687445557.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/62mre47kr9seihdsl3jkqb2h97/887718576.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/fubostbuaancv0ppdeabardnse/28841773635.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/61345117840.pdf
    • https://advantagelic.com/singhania/downloads/file/26741533013.pdf
    • http://enricobarraco.com/files/pategi.pdf
    • https://lescourailleurs.com/upload/editor/file/60454248837.pdf
    • https://bataretak.com/img/files/file/93821653509.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/tb4fg3dtbk0qff274hr4bc0qr6/gagukoroxafulonujuj.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607594a10a0d8---kilagufom.pdf
    • https://okvino.it/file/5489934500.pdf
    • http://vipnjl.com/userfiles/files/bowojatotu.pdf
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/dufajiweperinexazivavuzuf.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2e4877f30---77283348775.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+invisible+hand+concept+suggests+that
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8a3.bin
16eb1338e12d4516cc95921bb8a91e114e3eb727e7d7f24c177f79a85c7a77e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A3 16272 bytes
font_01_sfnt_off00011277.bin
a31e141fb2917ac6221449cb8c95e700680d048453672ad8ad57cd6853c5c53b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11277 16108 bytes
font_02_sfnt_off000127a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127A2 16792 bytes
font_03_sfnt_off00013fb9.bin
784dcdbbd139ac7e8bd3664582cfe477b1df607b40ca473fc35738c1c36be2d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB9 10960 bytes