Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b4459356d498df5…

MALICIOUS

PDF

68.1 KB Created: 2021-09-07 04:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2afdf0988e6f94b3ec300ab8d9a1222b SHA-1: d20ecd755bdb9458b4aa37b7a7494780795f5e57 SHA-256: 0b4459356d498df5224ae2d85b7893c0461c81bed4fa185f57ff508c77796315
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The heuristic 'PDF_IMAGE_LURE' indicates it's an image-only document designed to trick users into clicking a link. Multiple embedded URLs point to compromised CMS uploads and disposable hosting, suggesting a distribution mechanism for malicious content. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it's used to deliver a secondary payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://inwebjor.ru/uplcv?utm_term=swift+103%2F202+manual+download PDF link annotation
    • https://abe-rdc.com/userfiles/file/56835736249.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/bixubezevabumarofaja.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c645abd4863---loxonaziwema.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210814081221492.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/d867cbd342971aeabeb30c937bed15ff/joremofipotugex.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1621511326.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f92f72f18---29048482370.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/rezarilenizive.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/jerejajevugax.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/2c4ab0ed25b830647f72b26e6cbb883a/90379448568.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/b28a83d5e61787e73d8ea19f977d4c00/lijajugolob.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/tepid.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/n1k7psmb67vc580i6tm1l9pr34/sofelibugadedegufori.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/q7iile4qdgd3mbtd6hf76r6ul7/12705698750.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/43002998692.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/pufodigebiduzaposewof.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/diwumuxisupex.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/73516363943.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/0a78244aa2930b3970449ca82e98c714/19620879558.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/0jdgc1if5h047pq0c6fbli2os2/xomerubuwolijebi.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/70952286225.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/wajunus.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f04d6d57a13---nejafoweleru.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_off0000aee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE1 14052 bytes
SHA-256: e48557a3def967f74376d99af83983cffc351c32bd7cb37ecccb23b2355947a2
font_01_sfnt_off0000d167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 10876 bytes
SHA-256: 470b123d4cd5bc954e0c9a833cb79050b957ef95196fb067fc8aa4e986795ccf

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