Malicious PDF — malware analysis report

Static analysis result for SHA-256 45f23d5f5053e1e9…

MALICIOUS

PDF

77.0 KB Created: 2021-09-07 11:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 162388bb89911660fb76f224239e0402 SHA-1: a4ed6d7f541984b263bcf8070ad330635138de79 SHA-256: 45f23d5f5053e1e9d9446f7c4da1892b86ce73d394096be76541e1ebf038350e
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://medvor.ru/uplcv?utm_term=neurosurgery+fundamentals+pdf PDF link annotation
    • https://bhsbeacon.com/FCKeditor/file/migufuwafobuwajagig.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77391414cc---72519535988.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/dutifugajufotoxi.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/30223518182.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c05f4ae66---17450076921.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///71844876823.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611b860b9e4ae---16389673803.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/da7ac16d4218c5f83c7d0a096cd1f0d8/jitezubazo.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/48c3a62eb05061330fa0c46f504322d0/zenamapuzatitedepomojemav.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/cb22bc112cf1285f3ae4bb3e07a7854f/javulidegalanajuribu.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/vepuj.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/44927575461.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/46705880770.pdfIn PDF document text
    • http://freewest.at/39818434724.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/03vv1cu9fatael0igh6lesod80/vebem.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/l180mkr7iiafobckef847sdhf4/28374973310.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/pikanuwulotulipotukotixuk.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee902ddfcbd---77978019760.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210820020700.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/5jedf569av9l9imus8g6kbq7i8/vinis.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/58064839325.pdfIn PDF document text
    • http://miele-service-center.ru/uploads/files/welujumoxinilaloxivageti.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_off0000c787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC787 10940 bytes
SHA-256: 154cf1a1b761c5b38649e9f17a09e4834b57e9c8fe8c8904856fae0ee8549476
font_01_sfnt_off0000e0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D7 17676 bytes
SHA-256: 943ce6f6f087b761ca2024ee923d1ac0577f522754d9e6286afdf90387048852

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