Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce35c0074603975e…

MALICIOUS

PDF

70.0 KB Created: 2021-09-07 22:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8fe3aadadaa0529f2354d23b79a15ee2 SHA-1: 65d3e277ded063ccd60016f1ecf040eceed78d3b SHA-256: ce35c0074603975ec006ff34eac814884917905783e1f7dfb151c29e2d10994d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and a machine learning classifier. It employs an image-only lure, a common phishing tactic, to trick users into clicking a link. The document contains embedded JavaScript, likely intended to facilitate the redirection to malicious URLs hosted on compromised CMS uploads, which are part of a link farm designed for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • 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 69 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.
  • 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://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/01pkij62egvb6hf87f1p51ald2/99355004719.pdf In PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2529d753a84f1af9520f68ae8095d897/93758361417.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/sigatetewoteverejowurivu.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/wuwuwunizab.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/cbc4ee8cc2d3af6f9ae7fc40435a6921/54312047212.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/93986764613.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/912c647f4040cb5f2f1c8a3b496daeb9/67771127137.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/7eb65d4286bac61ecde93e35c4cb811e/77729251556.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/noxonekewejeve.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/60721263348.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/e99dcc0629af0b8bdcc2668499df8b66/sifotolaget.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/radewuvazaxuvamamujamew.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/65688934569.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa3bf676f5---69352819268.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b68aa78dfc9---bimaximad.pdfIn PDF document text
    • http://ranagro.com/files/koxulugiv.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/e2b6ec73a3f63ee0283d7ab8c3de3108/30785030594.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fbc2d966b---tusonalujibexodosumasafu.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/96377430471.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/34287126871.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/ruzonekuvafufurelek.pdfIn PDF document text
    • http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/gitutupagapis.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28735408141.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/28737772323.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/cc94ac6f7f2c292c2a8e2c562ac93121/xoduxenegupadifibopiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=mathematical+biology+2+pdfPDF 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_off0000b5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCA 14224 bytes
SHA-256: 66adfe9021804395b857e6bd8c10c101ad69a8c2d3e5df05d29d523126e8b071
font_02_sfnt_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 11060 bytes
SHA-256: 5f940e6166c145b3b41c78ea83d5591c604abda67574ec8ca6934e7aef96074c

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