Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd23b0fda8d2fdc…

MALICIOUS

PDF

81.4 KB Created: 2021-09-14 12:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 89441b69f434674f21ffb05c11a7f0b9 SHA-1: 9f9d5bcf5de3e1e7bd14179352e1314fdc862695 SHA-256: 1fd23b0fda8d2fdc2e275b71bf659d4e16c19c66cb60d9554a2efa25a06f11c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of external URIs and the overall structure strongly suggest it's a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://fedime.org/imagenes/84782920625.pdf In PDF document text
    • https://ldoris.com/upfile/files/20210903005625.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/73321193879.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/b44c55174b7b56f9cacfcd5e3f6af549/83054294974.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/1898364239.pdfIn PDF document text
    • https://fasaac.org/temp/files/tixekunerotoseziboma.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/52160615350.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/ganareguwatebosejire.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///26194473645.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/f19e943ff8bf733b01c15b37cda0baa3/kerutamalikurijita.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/34835376852.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/nikugotanejojezaxo.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/39675878861.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/papukonezixiw.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/7024820539.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd1aae79b1---marodawumuriwurafig.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/61454636273.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210904115423_810u2c.pdfIn PDF document text
    • http://quetthe.com/upload/files/29964703785.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135b11cd8f16---56722658796.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/92145322187.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/fenubulalesupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+motivation+manifesto+pdf+free+downloadPDF 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_off0000d7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E1 10876 bytes
SHA-256: 76658127233b061222dea931dcf47619666c960f07abf474a3cb87cd8377ebb9
font_01_sfnt_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 18148 bytes
SHA-256: c3235ba474089124baeff92f8b610bca3400f0f8e1ca10b1166180cd459cc03f
font_02_sfnt_off00011fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1