Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a1e5d2f5830414…

MALICIOUS

PDF

88.4 KB Created: 2021-07-02 12:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6acd78177fd52d93c13263ec9f74b8d0 SHA-1: 52285c547896e96075ed7ac4957b696cd92e79ab SHA-256: 23a1e5d2f583041459841d2d891a12d2c6463473ba3ed9121e84d58a35962494
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://fygl.net/uploads/file/181546096171.pdf In PDF document text
    • https://accuratesearch.com/userfiles/file/zugegetejewagob.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/82fc8dcf5002d312246f1034320128fd/dijilofamisaxidebe.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e67b3268e---40894626199.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/73095622866.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/a25c2e3b9dc92ff5164b97aa1d7ace4d/bawusibom.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077261dcc23b---ginexizigazetagururo.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/kerogozunesotarodozirub.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/wotaxutut.pdfIn PDF document text
    • http://tencanpowder.com/d/files/panotedasilarodabigadim.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/kirajiwazogarujozig.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/6282d75c647b55870a3aebc7d77eecaf/xuzidilobotiwakufobup.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7a79f01f7---63324365215.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/c9f3c2fa2aa3e2200c0bc5119275f888/28953929225.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/33565204077.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/32292910464.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/26144796058.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/vabedi.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/64341426292.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e8fb0d1b5---66162518752.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9804be3bd1---44014721820.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/25047211098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=deled+bstc+2020PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013506.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13506 18372 bytes
SHA-256: d43dadfb91447ab455c29dc06fa2cf3883a88c2cc930f5a223283fe3e130183c
font_00_sfnt_off0000d8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BE 10168 bytes
SHA-256: 74337faa8645d0a6d091d98a1efb7f833e5ecdc498bb6cebc048a8772e7cf194
font_01_sfnt_off0000efab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAB 17332 bytes
SHA-256: 0fb96cf41b688484c2032db6ba0c2f873520ca121188f06bc8b7669ac809b8d9
font_02_sfnt_off00011cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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