Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4714ab777742cce…

MALICIOUS

PDF

78.6 KB Created: 2021-09-07 21:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f87804ba2999e8a13796638942f4382a SHA-1: d954ae8aa61f4c6992d9af94627b34c4cfd43fe6 SHA-256: a4714ab777742cce0df5f3632783e4d32a09b87c8e4a265c211231cda12c0413
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://irlanc.ru/uplcv?utm_term=corporate+communication+effective+techniques+for+business+pdf PDF link annotation
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7927d2f56---xobovanowokazonibow.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c0ba3d523---lidofixerijabetojogana.pdfIn PDF document text
    • http://samtekelektrik.com/files/26169712348.pdfIn PDF document text
    • http://www.pilartangguh.com/file/83517232178.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce98dce255---34886112595.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/o6a4o4dchg3u3v5ofa73tnomgp/53538749377.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/rakomuwofelirolumapiviva.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beee606f5f1---82900654620.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/fijafukupudamokofowadova.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/1624533365601397908.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/wobopugusugepu.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/0ded1e3d83201b8d15c24f8bc302a321/49083625786.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/80728401136.pdfIn PDF document text
    • http://secretinvitation.net/images/files/lomokojubulu.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/44128651413.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/legagafibekevixe.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7fba814a6---15326928167.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/7572b3m14801s0knvqued02gvg/xugidazunabuzojomabat.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/28887517616.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126d296bdd4d---56169423337.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf331730b10---15642531294.pdfIn PDF document text
    • http://iwishop.hu/file/woziremolafofudagabazoko.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/71822073260.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29afe65a38---kofakajafekaxal.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5831059f22cf7df605c80a470676c9c9/8399341679.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_off0000cfd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD7 11320 bytes
SHA-256: 1a51b4687dbca08712975a4e3557293c9d5cc22374bbffa551f56d522851de6f
font_01_sfnt_off0000e9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E3 16536 bytes
SHA-256: c6f3eda15ad37b60bf3295694633ca32061097f21b7ef1f31cb9e182ec1d8000
font_02_sfnt_off00011437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11437 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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