Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57634ee1f59831b…

MALICIOUS

PDF

75.2 KB Created: 2021-09-05 16:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2e595034690c45196a1398b2e424af73 SHA-1: 8d9ad85ae1bad595cdc5e54d0f594bc298b5a077 SHA-256: f57634ee1f59831b1375d709290790d81546e8889f00321c42b554b37481a8d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. The document contains numerous external links, many hosted on compromised websites or disposable domains, suggesting it functions as a link farm to direct users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an intent to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://garglob.ru/uplcv?utm_term=mickey+mouse+para+pintar+pdf PDF link annotation
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161119c9ab7965---58211732570.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/18532775282.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/49273716555.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d82fc720d85f179bfc1cacb94e76596/24569040591.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/76439013797.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/jananugapukoteseju.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b949b46e0ed---24972104444.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160864f2286510---42069533292.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/71091959055.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/55154714317.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/gisapugafogavezitaje.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba029441d20---zilawofudufigofa.pdfIn PDF document text
    • http://haphadoor.com/upload/files/4888790723.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/60858860294.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/danenabuwukilir.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/pibiwitiwarifarej.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/xunaxafadelekurelosizuru.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/divilolexalopekuvut.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b382d0506---99739333550.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf77af0fec7b1d7e458572c99aebdf4f/paperupaze.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/tc8bgcfbdnn7pire9bh7jitlk5/37137797057.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d30ede266e---velediwolubagamoxozis.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/2ddbb85d08be1e6973329f8598cdf5de/puwesuga.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/94456633587.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_off0000c014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC014 11032 bytes
SHA-256: 9d2170c3c86153c1555c189378cf6766e8c48ef8ffa8d8c3638cb7f1e1c068d4
font_01_sfnt_off0000d9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E2 17732 bytes
SHA-256: 03c7372793f1ea87f4ffd4fb96d31776d836458e602cfd614bba6192b8ee0aec

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