Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e1260112aa3679…

MALICIOUS

PDF

76.0 KB Created: 2021-07-04 07:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1326ca5d0dd9d64e9a2e00013c99366e SHA-1: 7ecd04e3ea216efaeee073af69501405430087c4 SHA-256: f8e1260112aa36799b4cb56a15662c726b4578c9fdf00cf9fafe7462fd2ae03f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites. This suggests the file is designed to lure users into clicking malicious links, likely leading to further compromise or phishing attempts. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=ms+chouhan+chemistry+pdf PDF link annotation
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d73732697eb---nidor.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/q5h7v06p34lq1fm10q1f40e425/50987057064.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/larimumi.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/sajabimukoraj.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/84510541118.pdfIn PDF document text
    • http://rayanchem.com/d/files/81764749390.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/lefavobelonomomafatigik.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785d16022ea---xusuko.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/xivevala.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb16f33294---volararepabejolire.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bc7933d19---lifazadajarenewusilasu.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/2e4595484338e5723d54e4e7f0f3340c/muluxe.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607823c5dde9a---16363395208.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/23ccde3ca0202362e3888145a1e87644/79129103141.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/125d3fc792267ce8a92d37dab0b844f7/5599258876.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/20580104344.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/nuwuk.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc5b101619---naxalu.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/sejupojuwa.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/31258121828.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7d63e67b4---29814883951.pdfIn PDF document text
    • https://mytopics.it/uploads/file/razulelaziminitos.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/64986a43d1e20665e6492398efc4c7cf/xazinede.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/xepuzururejemeruxuluvi.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/9781316724.pdfIn PDF document text
    • http://bjjiffy.com/upload/jolew.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_off0000c5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B4 16668 bytes
SHA-256: 908f308a77279a30c000112e65b17d5342d521a097eda1a3bb0504f68b272912
font_01_sfnt_off0000f140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10957 11044 bytes
SHA-256: 5585037453639ae6fea88e5e9e934f7efc34b6caee6f49edebdecedb711f73ec

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