Malicious PDF — malware analysis report

Static analysis result for SHA-256 efccfbcec82c4ebc…

MALICIOUS

PDF

80.3 KB Created: 2021-09-08 06:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a02be3338cc2eb4e36ee3b111639c1d7 SHA-1: e010bce6ca1056a6dcb64d6bf812c845657cea52 SHA-256: efccfbcec82c4ebcf626ba3e7b90958215c01859307b1028234700e170815c71
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage or disposable hosting. The presence of embedded JavaScript, flagged by PDF_JS, suggests potential for malicious scripting. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=arabic+letter+chart+pdf PDF link annotation
    • http://etkenkalip.com/CodeignterProject/vizyon/files/pibexusofivazufix.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b7b3ffc2d59b739ab0fb973698535c45/dapizigijirew.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/dotarepudunib.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/54811009135.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/zukodogufiparadijewakasin.pdfIn PDF document text
    • http://adveotec.com/img/file/zolimunesijoxedudiwuwine.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/54ced48e031db54bdff1b2b2be704023/22051781400.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73c3520fa---27528581965.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/bekubuxigabijigemibexuz.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d0172a4a2---bebigowiwefubewi.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/femipilekiwuwu.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/93092696644.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/patipuxifatut.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/gadolojukazaguligapebev.pdfIn PDF document text
    • http://kkslavicin.cz/sites/default/files/file/41044847803.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732432098e3---43029561678.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/sakuxebinotuzutiwamate.pdfIn PDF document text
    • https://southafricapools.com/contents/files/lifuxojivobiwexuzajijuf.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/vewimufuwivutejebig.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160718f995125a---59051392311.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/mulawakemegilarig.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_off0000d320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD320 10444 bytes
SHA-256: 2c9c71621ff6b1bc8b467efcdda64b28cb7431f9455c71fc19c6ca1c23864417
font_01_sfnt_off0000eabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 18744 bytes
SHA-256: fff2211949115385969555f54057559fcf512a69de530d87628551c630f5b172

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