Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6e3a1d93ab0735…

MALICIOUS

PDF

74.0 KB Created: 2021-09-07 23:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b1cc589d3dd88014441b0585f9312f1 SHA-1: 74c87adeb618fb3caf6481e009f7e61e7b34eac3 SHA-256: 2c6e3a1d93ab0735e49b89242d6e578f2cdab9c8ac0683907051cb8fb3a33834
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan. No scripts were extracted, but the PDF structure itself is leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=architect+scale+worksheet PDF link annotation
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/3s9i4ia4kaftkp6u29m33a2dfh/19727230277.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/78972111001.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a7dc3df85---xopufaxudinapenulul.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/4g9dfdnabcmah86pcmcn05bv6q/16483459953.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/jebof.pdfIn PDF document text
    • http://falerisztika.hu/tmp/zexolisodedipex.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021531114333787.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/kabefiw.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/lafeverukatenagid.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/31713193755.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/4v7o3jnk6s7hqqrqf1c2anjqck/13317038220.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/79536783063.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9161a8c090---6683502666.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/podovowimurilalex.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/cb3b87eb142421c716019be24ed97f30/binubufibinerabaromojanaz.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/nekokamono.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/74733543873.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/30914410417.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/46812067550.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/27377932388.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bd50621dd---8224692851.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/bazej.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/6ccf2dd6fa7821c97dcc96259f892d4e/letixavizozavirubimi.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607471ac55fde---lipogegom.pdfIn PDF document text
    • 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_off0000c167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97E 10380 bytes
SHA-256: 0f1139411dc3ed01f2062460a0802d66c5bbe541cc1da5c35d2e9656aa9dfb22
font_02_sfnt_off0000f136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF136 16404 bytes
SHA-256: 55567f3e692cfff49d41e515b98cba6c314c068dc60e7be4997b4cba75555213

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