Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5805e91bab6631e…

MALICIOUS

PDF

75.5 KB Created: 2021-09-14 12:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e97657fa695061cd371743b4b72ac25e SHA-1: 787498311cfbdb1452b4109db38b54ef8fe57f0a SHA-256: b5805e91bab6631ef18a2a4bdb34aae02bbd012eb4336b537bca439984e6c8be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF contains embedded JavaScript and numerous external URIs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or trick users into downloading further payloads. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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://coretry.ru/uplcv?utm_term=unlock+developer+settings+android PDF link annotation
    • http://eros-arena.de/eros/userfiles/file/wivosemubazomalogibomikig.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/witepagisesenuxi.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/nisurexusiko.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/junizut.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/82058920373.pdfIn PDF document text
    • https://kawanmto.info/contents/files/wobodopominu.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/53769969931.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/bd21f289409563d289075a9b36e86601/38503504156.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/vonir.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210906002306223266zxn17n.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/zakebujesokinibutabox.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/29407019223.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/sigipezatotekipimixax.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/67746137333.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/vegapugerupivo.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210914112322.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/bomilamirex.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/saxajopupixogeb.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/supujanune.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/bekozijujowamutomonetuken.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/r5oe1te6rn3dmbid5fskp1llds/52421250281.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/govanigitureganovag.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eead31ce81---38051289782.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_off0000c4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A4 16512 bytes
SHA-256: 6f349b2329b2c6df4077604e5e8e4f9362ff89e5f1771383ffcdace482204b32
font_01_sfnt_off0000ef2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10742 10856 bytes
SHA-256: af604ada93d10cf2a1cafa332a7307efc2faf10ee81ad59393bd6570b334c458

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