Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc306669ca075c8…

MALICIOUS

PDF

86.5 KB Created: 2021-06-28 19:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97ec8d0e3cb3bea93b516c81f0852c3c SHA-1: a43fa47f4a2d5e7cd09e2df0162dbc9b9806a831 SHA-256: 8bc306669ca075c80d23d4db92c99755425ca5e71e6f7d7c8e1d0e2693106d70
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or malware distribution attempt. The document contains a link farm hosted on compromised WordPress upload directories, directing users to potentially malicious PDF files. The presence of multiple distinct hosts and a UTM term redirector suggests an effort to obscure the final destination and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/c24esbc7tjvu5dp4oqt3vgn5v4/20403467739.pdf
    • https://kisikana.hr/userfiles/file/22095803525.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd8ab9daa6---27615465442.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/54091312baead27e587b27f422e2e091/45713001928.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/h383k20hcasbsfk2sgeoq1gm7r/rovijebokezoma.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/0063b296080ff633fca8c5485abc6a83/80766276005.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3cc769b27221f1ebd8072d59e8e45128/32886837297.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8a76551e0---lutakerokatipagupoded.pdf
    • http://vaness-sens.fr/ckfinder/userfiles/files/74811348305.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/sn8lp721q0lmnb8kb6u0h5ajc4/mitenofazawitavasalelogop.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160799d55796e6---godeket.pdf
    • https://al-farh-iq.com/upload/userfiles/file/batakotodoxikutok.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e62023bb28cfe5f6e2f623283d700854/33231756033.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc5eae5902---bisepepupa.pdf
    • http://absolutelyneon.com/userfiles/file/maxepixojix.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/ddb456c4d87aa65813616cf4ac443466/kofoketew.pdf
    • http://bajajsports.com/userfiles/file/67919238332.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/59333891fa57cdb5a9c980c0b8a63b3a/19461736775.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/0bf8ab161a63770efe4cd34990c60737/nebiborexujasorediwil.pdf
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/gavumebaxus.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ffkb02vd0hvgdhmgo01qtteiq7/82571649244.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=filariasis+is+caused+by+which+worm
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f118.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 16792 bytes
font_01_sfnt_off0001092f.bin
c122fa1e40192647217f54820bbc3cf6a3cecb5e4a34cc2bbe07e29471427f61
pdf-font-stream PDF embedded font (sfnt) at offset 0x1092F 10852 bytes
font_02_sfnt_off0001223c.bin
be144483088a6f03fb47c286b43cd745897efccabd390f398ad72a442f714514
pdf-font-stream PDF embedded font (sfnt) at offset 0x1223C 16412 bytes