Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ec78d3bfcbfef0…

MALICIOUS

PDF

126.4 KB Created: 2021-07-04 07:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 39cf69fd13864058b517d2cb1601792c SHA-1: b241c85da39c42ff7c7bff8b67112c0cb28222a6 SHA-256: 44ec78d3bfcbfef09fadd3512a11d154e507589bdfe72b33ca977b50a9a6ea26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to exploit vulnerabilities or trick users into visiting malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=hypo+meaning+in+telugu PDF link annotation
    • http://ipceurope.eu/assets/file/pezufirilonisafogonikaru.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/m0bditbf0c5qas9b3la6rga0mr/22279589957.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/29184903958.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e77dcc52b---60216644663.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/38777399585.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/82eec6da3cf5181fcb1c3b3acd6e3b27/16852767311.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a5be22255---xugonuru.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b55ac03f79a---lozupabeketusome.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/8473d2c9e0eb33eea91607ede742ec00/73791580719.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861ddc5584b---ratotimibefowazamatuxama.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/4qfkgknq4stp5jq2lsvq5ablvc/takeje.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a03781491---53138606321.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/82155872688.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/92017478784.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/tech972dh6ujmsc3c8jrhl82mj/4507514222.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/baporuguwi.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a415576e8e1---31425471513.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/7aad07b89289b6e51a807eb2d8a3b6fd/43687966591.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ad5496e12---balev.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/rorexetinadefoduwipobama.pdfIn PDF document text
    • http://tcihk.com/userfiles/64930344826.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6fde59274---wuvimeji.pdfIn PDF document text
    • https://schmitz.cz/res/file/jarinefilipeguxuwemomijom.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/galetoline.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_off000184bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19CCD 20280 bytes
SHA-256: 0d86377bd57a33c78ceff3966195f90ef7f3a75bc0b7726c6f36b9d6581018bf
font_02_sfnt_off0001d2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2C5 10532 bytes
SHA-256: 9738e9c03a1fa0c8c2853e12a5fd83bbfb71be46a60d14b707688c519d26682b

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