Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1291c1d089d358…

MALICIOUS

PDF

86.0 KB Created: 2021-09-08 04:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1d6fe3814e793a4534d9c1d16b415b62 SHA-1: ae1c68013e0e4fc1dcc92b4c05086a0c5d45ea42 SHA-256: 8d1291c1d089d358ce96709e19668a25973f301e2e2404456578278dc79ad754
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest this PDF is used as a lure, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=dodecaedro+estrellado+pdf PDF link annotation
    • https://dichvuketoanvn.org/uploads/files/dofebiruvawuri.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/94858194600.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/94b6b81244972cac72d1769998865013/pemobaz.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/tusuriguresu.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/19106679422.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/069d85950f897deab6615826f86ef3a1/mufiwamixik.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/movavitugimajasata.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/62948124885.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d99e384f767---59545859497.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608154439bee6---funeravuzasu.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/10398592423.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/kekonosuleleri.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/78978865030.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/zenuwezumupusavin.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5bbb34e99---luvewiwi.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/dofozewo.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/v8scvdrptqhsb1v32h75mtsbmd/xitavizixa.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/69528619796.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ce34e151b98d42011f1c0e8fbf8fc94/filoja.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9g65escf9k6mk1pjf54qvat8o3/66334847517.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607242ec9a1d8---75155545297.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/1873588761.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4650a3c71---33763315219.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/eae5af0cfebe12bffbe2b3f9ba2f869e/gonaji.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_off0000e4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD00 20604 bytes
SHA-256: 03cc38d5de59778a3d2d87fccbd34e692cd23912dbe4af1411c07e9b904f34be
font_02_sfnt_off00013165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13165 10420 bytes
SHA-256: 4bff6a4d54273635805fea7604e8199cf0d0318fa9933380e9d8ad4e202ba828

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