Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6fa8cedb4fe150…

MALICIOUS

PDF

149.2 KB Created: 2021-07-15 16:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7ef2533eb3d293263196579d2d4e6105 SHA-1: f955078ba4bd02c9f95dfc5d7552e69d4d5b09e7 SHA-256: de6fa8cedb4fe15099b9568229bb8a887bc9ed5ee662dd0d68edb52016618c74
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of multiple external URIs and the heuristic findings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9321

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 http://metall-press.ru/files/kitugazasutipijet.pdf In PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/6333638767.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/pivajixodejow.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/45305223379.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/81302004872.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/81298246544.pdfIn PDF document text
    • http://hasekei.jp/userfiles/file/modisuziwabet.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/op6obkqbp065iv1e8lbgub3fr5/laruvogagisa.pdfIn PDF document text
    • http://mtprospectbaptist.org/clients/7/74/74f10a8404da00fab064704771972c19/File/bumomamejorerit.pdfIn PDF document text
    • https://people11people.com/uploads/File/gepur.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/d48cca68418bb03a47e0d7d2f04b7e14/1783414076.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/04ddd28dc61cfd14f24433ed3332d29d/giwaxesibam.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/jepuvetujukedogi.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/bubakanawezasijulukoxovar.pdfIn PDF document text
    • https://ancoraeducacion.com/images/12923756170.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/75054579792.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a8b397412---xaxisorexawumazarusalijin.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/56447826776.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/86412709532.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/xefipelukusaletoru.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e5418993b---nimewexo.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/13013935735.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adb471065bf---xilisolesuvuw.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4007e79ef---75171963552.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/cko6k9o1cgfeba0fg95kmgcqm1/86710064521.pdfIn PDF document text
    • http://net-marketing.hu/images/files/93066763700.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/4lt5if18uq85ssplk4u8u1meef/11655102790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=nioh+level+up+guidePDF 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_off0001662b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1662B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E42 10180 bytes
SHA-256: 32ed08b01736136918d319e3e0fb4b3c3e5bf3ace8ee6e84b014c5d25e8af874
font_02_sfnt_off000194de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194DE 47948 bytes
SHA-256: c92690ba074e4b6421ec516299feeccdc319d6ceae5e21a1bb60dc4d4d61ffa2
font_03_sfnt_off0002197f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2197F 17624 bytes
SHA-256: 7aa22affde796e5943eeb2541e9049aa0d7c30dafecc326284dd072337448d51

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