Malicious PDF — malware analysis report

Static analysis result for SHA-256 607a0bfea18e489c…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 06:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aec8dc1836f6c4f8affb6e9572667708 SHA-1: d23e155503ffd4aa6097f4ec85c5786210907af2 SHA-256: 607a0bfea18e489ce1565e1a0e586969fca5b27991d800c85353e892fc9a2fb0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many hosted on compromised WordPress sites, suggests a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely a deceptive invoice or payment request, a common social engineering tactic. Although no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest it's a phishing document intended to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://catamma.ru/uplcv?utm_term=lei+do+inquilinato+pdf+2019 PDF link annotation
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095600f42512---xasaxuvevewutadinepateb.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/84534601753.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/l4l6vjs3ggdr8f7ast7a2a8oh5/48954854091.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/kedetibig.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/44358b01d87ea1335685689de81e2463/madirul.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608869c9eb7e7---89082613427.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/096e5d7d74edaf79277ec2680b4853b9/petepi.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/e347b8696e62ff56fd4d70affbaf258a/bewopakatiteneriludagukaf.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/41716556301.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/defidakowalavebobot.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/29807813356.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/96epo0uu6shppa9h2pk06gh722/17888125512.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/vusuwozugavigix.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/94195521308.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/455377e270b1d5ded19e9f30b6f618b0/xexanivukurepoxusi.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/5bfd4fa583ca075f4e6cc57fa2d56ee2/mefafozizozu.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20216101950296608.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/9751790511ab7c9f8776ca09cc49b322/jojuwapo.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa10774fb---44424421244.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210719_005601.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/kufipari.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/24878435422.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04a796f6fb---10335328182.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/82984392620.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/98794880786.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_off0000de60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE60 10888 bytes
SHA-256: 7414980213b30d98b2ae710fb60266c9d015f4741b6417adc15163e253586d10
font_01_sfnt_off0000f77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F91 18084 bytes
SHA-256: 8d01061f5dc066df9718f893c9fadfa9c4a74fadb1ec7cd419e932293be0e5ee

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