Malicious PDF — malware analysis report

Static analysis result for SHA-256 40797dbec45de5c4…

MALICIOUS

PDF

113.0 KB Created: 2021-06-26 17:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a7a10591ba774bc5dcd32a40347b73c3 SHA-1: 045adc6ab9a1ab46e6b558e515d93102a24d1220 SHA-256: 40797dbec45de5c47cec8bb7633904f778bf02935b4613ce4777384e4c7480f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which appear to be hosted on compromised WordPress installations or disposable domains. The primary function seems to be redirecting users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://wastran.ru/uplcv?utm_term=light+colored+border+collie PDF link annotation
    • https://reparationmobile.net/userfiles/file/83274650178.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/0e18255607fcbd414fb245ac352ad4d4/78129282877.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6ea470426---wimosepujuresuda.pdfIn PDF document text
    • http://nfc.soo.jp/file/34085053476.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c22c28c9d---bavivokegebatiwaju.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/91079711440.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b51cfb04876---memabivamobebi.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/5222071086.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/an1rib24kn39jqgn2c1dhheaer/33613751458.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/938b4ef15a07502327052f7d1206b3ff/5945739382.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a92e947d893---37324709485.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081849dac0d2---xasaxeliwiwupogukidi.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/lukeruwalibokegirabowu.pdfIn PDF document text
    • http://jkmdc.com/aversystem.com/userfiles/file/tifaminezewatukur.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/8440594518.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a013a0120b1---wogonuse.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/6257268371.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/kabapukakudo.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/17c69874f1b6cb5752e544e73b896dba/bavuv.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a95cddcd40---wulureze.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2ca9529e5---pidubitixedugelujox.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc51360d68---simekuve.pdfIn PDF document text
    • http://24cvety.ru/upload/files/dafanafunogogetasefa.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a116019add0e0be4d43090eaa1a5f909/72154856469.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_off000158ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158FF 10312 bytes
SHA-256: 9e8f76c3bd0047264197d5cf1773420ffe0f1d124b3e2b1fb532febaa2a1da4b
font_01_sfnt_off00017019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001882b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1882B 17900 bytes
SHA-256: bfdc6449a7ed4a9ca574fe65a83b1221320d463e3130fd1ebcd12acab3fe1217

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