Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97c6fb435951fd8…

MALICIOUS

PDF

67.0 KB Created: 2021-09-19 02:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d4a503460ce1803be4b3308303b1c0a SHA-1: e5cb34e7f83ebf1eda02eb27b888456c4fa7f3f3 SHA-256: b97c6fb435951fd8cbf2ba3af29c6fc62da4a9dc8d2daeafda0e900cb0dbbd3f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links, a common tactic to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external URIs, many hosted on compromised CMS platforms or disposable domains, suggest a campaign to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 66 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://coretry.ru/uplcv?utm_term=android+examples+download PDF link annotation
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614145e723dec---50076315283.pdfIn PDF document text
    • https://migger.dk/userimages/file/21880150424.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/8217119126.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/26204871078.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/warok.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/774c97da99d7b25cc54ce61a614c7dba/butonajusebajakuf.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/33319424778.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/18191624668.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/jusavoporerilaw.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/86452217740.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/pgp0m1rmd0c5b62lftl6io48lr/lifikidupulapazeg.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/fajinavuzo.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378d3e350e0---lagowizigefasuter.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/19209086971.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/56085775987.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/sopokulitofikasepife.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/92033167736.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/vawumuwiliwuxaseva.pdfIn PDF document text
    • https://basisnomor.com/contents/files/56903668908.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/52094615314.pdfIn PDF document text
    • https://arendic.cl/files/teregeni.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_off0000ab94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB94 14060 bytes
SHA-256: e9257be11a1e97465b9a1ec173b01c66a491cfb177bcb8c66bab862f4864d388
font_01_sfnt_off0000ce7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE695 10624 bytes
SHA-256: 5d52cf239e55633078f769440293d4ce9a844d7a7acb78c852fd1a6a5f5c216a

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