Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36a2715cd01f033…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 05:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30ac4746405e24ac58cacb1ff2d81d85 SHA-1: 4865efc435e1041ada53f5f62c1cad9feda34c9b SHA-256: b36a2715cd01f03341ce91dd4e823b39deaf4856d8d4bc0d8b269410e00eef01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ungaggoksdb1gcga5b82nrms67/90803327336.pdf In PDF document text
    • https://soudurelauziere.com/upload/editor/file/5212409934.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/womoxinuzuganewuwadodu.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/54417234615.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16083a766b4080---biwolunivawul.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/10769063310.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/jigezerotu.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/rutofusajemigeralevuze.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/61017141212.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210730_D1ED26A28396067E.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/694u67ulu6l4u4uso8durcf020/62729119888.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/45945835438.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/fd9vo0q1cbm7o8gdnvn6bmp3th/gowogajoliri.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/8c5ab8a276207c792e4c60284417c148/mixixujunaside.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d487bd5d38---vivafupibixe.pdfIn PDF document text
    • http://kite-surf.sk/files/nagewokojagebalonu.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/68388627767.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/f63e9c2fd64442ad7e4d06097a7c193b/gukiwadinajagamunenifis.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/kizudaropofudujolofuzur.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8438791a0c---2120093068.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021071011343180554.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f63565cda0---jiwafaxuw.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/lodubexujewojeji.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/a7b01260cc7525c2ce3ead69aae8c8ea/revagidabukil.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/vofafis.pdfIn PDF document text
    • https://electroagro.es/pub/files/94546395507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=vocabulary+in+bangla+pdfPDF 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
font_00_sfnt_off0000bb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6E 16432 bytes
SHA-256: 6886318e6218e1fcd026638dbee99acbeb6dbb33c804dd0df22126ee37f015cd
font_01_sfnt_off0000d20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20C 21444 bytes
SHA-256: bfbcd6f789efbbb78a54fdf4356ab76366581c2f4434dcdd008e2f9f0f7c3ac6
font_02_sfnt_off00010a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12220 10720 bytes
SHA-256: efd6365ddd234c0bae584063879184b969a1e1f3ec02959fa4363584440aec53

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