Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8b354073a7fbad…

MALICIOUS

PDF

92.6 KB Created: 2021-07-27 19:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 147d4778b3d0956cf94bc390a9dfba40 SHA-1: 2c719785390dc55e4b6c2b9969d308d003f2e961 SHA-256: 7b8b354073a7fbad159c57aba16a57d26f32782d97ab222c0344c63fb9891f7f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics indicating malicious intent, including embedded JavaScript and a high number of external links, many pointing to compromised or disposable hosting. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript and link farm suggest an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://chiengthai.com/file_media/file_image/file/47892061446.pdf In PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945c83ccce8---32866145599.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/22718642758.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/12743259383.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/65116512674.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee25de42c6---retutetawixixixujefagesug.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/219477c6cb637f4e71a6d76296869125/jegetopipi.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/79809600205.pdfIn PDF document text
    • https://scriptdd.com/_file/file/berarozaxatidivikaxupo.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/45173998795.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/3305295725.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/t7ri3vt0lkng9a14lunrlebvkv/vopakodafe.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/bfdbb4a4d3fe0d669b80489ccb818b7d/69960469122.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/89385025712.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/oqtqgtqqnf5aphqivdthnobcch/78185195368.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/15846068639.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/werob.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903ddc3d226---nulokopawadoxolapamof.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/81651120347.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/ab2898733855b64f38f903fe746b06db/40208083672.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/17644126275.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/68600676831.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160854109479f3---88270780762.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/f7e2b7dbdff8ff315c09146d518f468b/62766889311.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/30484259287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=%D0%BA%D0%BE%D0%BD%D1%82%D1%80%D0%BE%D0%BB%D1%8C%D0%BD%D0%B0%D1%8F+%D1%80%D0%B0%D0%B1%D0%BE%D1%82%D0%B0+%D0%BF%D0%BE+%D0%B0%D0%BD%D0%B3%D0%BB%D0%B8%D0%B9%D1%81%D0%BA%D0%BE%D0%BC%D1%83+%D1%8F%D0%B7%D1%8B%D0%BA%D1%83+6+%D0%BA%D0%BB%D0%B0%D1%81%D1%81+%D0%B2%D0%B0%D1%83%D0%BB%D0%B8%D0%BD%D0%B0+4+%D0%BC%D0%BE%D0%B4%D1%83%D0%BB%D1%8CPDF link annotation
    • 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_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 11780 bytes
SHA-256: 3d93957892d15c65dd85778e4b72220d5e27274e5f0035b9274a77fc98ec10f1
font_01_sfnt_off00010ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDC 23248 bytes
SHA-256: 658588810367892ea5e7c8bf98e5647d75d04091cd14c7afde130d3dd28d2d6e
font_02_sfnt_off000146da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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