Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a3445c2eda97df…

MALICIOUS

PDF

85.4 KB Created: 2021-06-28 15:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: abac36f41ebfa6fbda2b0445f6328729 SHA-1: cea31e89918a6b9933f453c2bb50f670e4d4b52f SHA-256: c1a3445c2eda97df14028eaea4c948abb3c502f331103b7a8c022745561e5123
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous embedded URLs, many hosted on compromised WordPress sites, suggest a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be junk data, reinforcing the malicious intent of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=past+tense+active+and+passive+voice
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7d9f0bc24---ranilubopajaxili.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6b127a92a---torufivekin.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f63a96bbda---rosumim.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6186a04436---xusebusenezetudowizux.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/ee45e8e85b2c73a4dc3836a7b5e6ad4a/82217211020.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2130ec3d1---rulotori.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/b900a61ce0e4c88108d1445b6a58dcdd/76822932032.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae7e882c5---nojilobiw.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0de586097---wamajutekesagunivubugene.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/0710e397ff0b814c6aed79f8b265d789/mejijavubuzibo.pdf
    • http://dush-kz.ru/uploads/fck/file/zafikafelixow.pdf
    • http://allamericannursing.com/userfiles/file/ginunoregadugipezigajej.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd183337f6---solapamafoxemoga.pdf
    • http://sushi-belovo.ru/files/11113815946.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/8f83dad8d4d8deddea97a6eb88120e35/rarudapu.pdf
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/34c40vtat8ie3lnrjdfet5hn5d/36342645331.pdf
    • https://unibel.pl/pliki/upload/file/dozadani.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091696524468---11821800275.pdf
    • http://villa-carlshorst.de/sites/default/files/file/13657760195.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/vanenevotonufiru.pdf
    • https://taperagi.com/contents//files/pomovokojivugusa.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160772fc01d38e---14257292753.pdf
    • http://flambotour.it/themes/userfiles//files/58217700961.pdf
    • https://groupunsur1.com/contents//files/rasabevezop.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_off0000ea6b.bin
9fe0e10e868bdd9a38fe0aca22a4ed98f8e819f8c053231c0a3bac453e5ff2c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 10428 bytes
font_01_sfnt_off00010238.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 16792 bytes
font_02_sfnt_off00011a4a.bin
485b00bc97eb12fde3025b5574bbaac6d5df29bf7ae60f572f33d3a355e54526		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4A 17956 bytes

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