Malicious PDF — malware analysis report

Static analysis result for SHA-256 820fa4da547624d2…

MALICIOUS

PDF

87.9 KB Created: 2021-07-28 03:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5932ba9a9abe57f342970bbd5d6a1ac8 SHA-1: 7a6a97646cd898c037b8f0a483f1a9ed0c3e83e5 SHA-256: 820fa4da547624d281a8d2db98e8a77d096091bbad7bbec6f09a3af8e82cd33b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to redirect users to malicious sites. The PDF structure and embedded URLs strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c997bcaacf4---sazazasalen.pdf In PDF document text
    • http://hkacca.com/userfiles/6679779630.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5fc43172---65761654103.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ce686dc6fb1---genuxaxal.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cce206905e5---25342029158.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/46419643314.pdfIn PDF document text
    • http://wamer.org/userfiles/file/15481245741.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/4c73e10616ce212f0d567331a1a30db6/remobanarokesuvixup.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a9520fe65d05d9c718875fccddc7adde/38577492647.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/eb9d7a84c0e3a365a8bc137e90a834c8/51342348120.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/84868913454.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/jowinafibanenidimolojeku.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801c0e38731---dufatesozaz.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/49ef89bdb0733bc74fc9ff54f5611b00/12342853610.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/935646b3c055253d16d07e785b746d5b/75527743163.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59683f2eae---zexujurunukoziri.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/60494760651.pdfIn PDF document text
    • http://coffee33.ru/archive/file/daxofepewiso.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/17914889999.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/damabamugugileto.pdfIn PDF document text
    • http://tms-operation.com/upload/files/wolevumeziropagar.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/xoguzebexenonizuwakurexo.pdfIn PDF document text
    • http://come2menorca.com/images/file/kotuwenofofagekubof.pdfIn PDF document text
    • http://iccarrentals.com/files/file/86667629805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=landorus+therian+forme+pokemon+go+movesetPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 11116 bytes
SHA-256: 6980bf2f4b36515aa63c6bbe6ec7474d135b88717f39366e810bf2645ce6e9f4
font_02_sfnt_off000121aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AA 17308 bytes
SHA-256: 9606da92869c2a169020ee7f43daf030a03092c0eebb1386f64c1f0fa25c6d6b

Open this report in the interactive analyzer, or submit your own file for analysis.