Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63599ce50464280…

MALICIOUS

PDF

91.5 KB Created: 2021-09-05 05:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b058caffb7705ec64a0d33c330ffcd47 SHA-1: a152f9bfeb0edbf1f1b4ffa5e523b6d97f02f714 SHA-256: f63599ce5046428021f960655a4e3323b788c6beee4282358b680ceab9301803
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or link-farming operation. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user engagement with the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=phrasal+verbs+most+used+pdf PDF link annotation
    • https://geniodelweb.com/file/50531008629.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dacd8da7971---tipatekorivagagebuj.pdfIn PDF document text
    • https://austarpharma.com/upload/files/40866471431.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/filonuperenila.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/85205436006.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/wisop.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4e7cb08bbf---mitonafodomobowagar.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/ea858f097af017c34f3eb2952fd88837/petalupamifemeget.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612df19380ae3---kosanatarutisuk.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9f2769ff15e7833196b45a2a0593f61d/fubalafiwilolo.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/79b14291b041f7c459ec13bc023c314f/wibowogadibovuxe.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/dolivut.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/60327513949.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087e73588f6b---xagovudexizetegoxa.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/0d8135687b3c8501fdb4e74cee873934/gijulanixuronor.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/402ea80a4f22de4b2d13542bd90d2192/5400394184.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d89cd632a5---56732983346.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b53c1e9f34---penokoganeritine.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160adb4017f9b9---perujomofibubijijidaw.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/66886284525.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/6fe49c2e0c1f42e6bd240bc46fb2fe89/vofomekimaf.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/9eb9d3f950256ec44e2e9df315e51065/kovesil.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/46978940770.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851660636e1---xinerokibuwedoxigaso.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d00aa5c5d5ceda9dfb08c58975c9e6f2/82049055419.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_off0001014c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014C 18120 bytes
SHA-256: 0c2ee3a276e32c72d62f0a84d17c68e96f52269d336eaf78ce81c7fa05df8f8a
font_01_sfnt_off00012f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14763 10876 bytes
SHA-256: a5a1d5ace82c0061eb9c0d07e7f17e8a16028673415e4044bfa258eeeccf9b19

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