Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddba334c11d099db…

MALICIOUS

PDF

86.4 KB Created: 2021-06-29 13:36:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95c20031430dce4c24a590cb9ad47e8e SHA-1: bf7c5077f96083bba3c8c8e00e3ed05a3cee9e83 SHA-256: ddba334c11d099db7278bcf312b5bb321d6abb87fcf5908b46f94dfe30c5bc8e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains a malicious payload. The document's structure and embedded URLs suggest a phishing lure, potentially disguised as a resume or invoice, directing users to compromised websites. The presence of numerous links to compromised CMS uploads and disposable hosting further supports a malicious intent to distribute further malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://queure.ru/uplcv?utm_term=please+find+the+attached+resume+for+your+consideration
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ttl2mte7vk1kkeg5gltgltifqk/vulekegep.pdf
    • http://agisma.ru/files/pages/files/71210498422.pdf
    • http://buergerforum-tirol.at/file/fujavisaxomo.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb88c0c14a---bumiwalobofederegagare.pdf
    • http://cpils.com/userfiles/file/pezawobupog.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78efc0c020---wesemu.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/7ac21fe479d05a065d5a8d09d962cd82/junezenijifazuxap.pdf
    • http://blevy.com/ckfinder/userfiles/files/80611472824.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6560a6025---85759577731.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609080f0aa67f---xenes.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/6567fdc2eed112dedcfa23f719a47f59/9272534250.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/1d67f8edd71ab98139aac553f483b43a/21327530905.pdf
    • http://bocghedanang.com/media/ftp/file/25433981171.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c504c6880fb3213e168f1d2e332dafa7/55704276876.pdf
    • https://estoniapools.com/contents//files/siwefulebawigifovi.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a53f85e13---83453177771.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e726e91267---moxuvijajiligej.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8bba4dba6---nelaxubip.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfa4c47e90---xibadutunawukovo.pdf
    • http://maynenkhiinverter.com/media/ftp/file/zusujakosojetekigiboji.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7804fe93bc---5734898520.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/dfk4tpm9gbuo9mqsarlml75fu1/58127194063.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49a2039525---fizikutifimifusaxojiwo.pdf
    • http://plncse.hu/php_data/file/85412490590.pdf
    • http://yourtruck.be/upload/ckeditor/file/55920741027.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec4c.bin
86bebedc9c2f8510214a1480660286c484a11d7817f875dc66a441ee2268cd89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4C 17600 bytes
font_01_sfnt_off00011aaa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAA 16792 bytes
font_02_sfnt_off000132c1.bin
a206dd74b70970a548560f3b4502bbcaaf19cbfd974d16adfd56a87563495869		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132C1 10956 bytes

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