Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da00981e7359542…

MALICIOUS

PDF

92.7 KB Created: 2021-06-30 12:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c42d62116748543c9925195055430ed5 SHA-1: bd27f3bbc3c0f952e9ac94cc61ffe491528ae5bf SHA-256: 7da00981e735954294ee164da8111c77f575c2bf89cb17563ca464437b906f6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and link farm heuristic point towards a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c18014d790---xetirakagawemewobasezuwe.pdf In PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/12448498963.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/45g8ng0afp5gj8qe26oin4ott3/65222160874.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/33004945792.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/44718475833.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160be7ac7ce584---58369882060.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b83bd6a7e---boxidavimipevefamiv.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5j6l69npgpoin6g5fe9qapsia7/mebotonodub.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/b957384df19d592c800f0e6e0f856d7c/87210045360.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/55567790882.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/37250676290.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/3975439684.pdfIn PDF document text
    • https://badoza.net/userfiles/file/savolalewuzunefudilavili.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/bv3alkr3lqpfc12la4vmu5qto5/lokopugajujexisemoniwere.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/gixul.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/fulib.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e875067a5---32863415023.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/7d658b568700edeb2f127fe73bb078d9/xotefirenopafabolibimu.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/0vgu5mbdv51f8ju40u82nc55tt/xonogukaxilowep.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/dfeulj8fmdeci17md3ftmd6c56/kemeketedexesekivow.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/tegora.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/at816lokq4e0cfiv9piiqs6ik4/25085032226.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/nunafotekat.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d84644664a9---lesizomapulogasuwabiputi.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/ridipuzip.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210510081807.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=concurrent+processes+in+operating+system+pdfPDF 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_off000103d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D2 17868 bytes
SHA-256: 169a10853ee77cd59214964b863ccba6ac2156746f584275573e1dddae556167
font_01_sfnt_off00013310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13310 11160 bytes
SHA-256: 79f35c348ff171cf5c2f58320b8e7b890b43a917656d4c5ac344ad17fe8474d7
font_02_sfnt_off00014d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1