Malicious PDF — malware analysis report

Static analysis result for SHA-256 763656ff41a61d6a…

MALICIOUS

PDF

102.6 KB Created: 2021-09-04 14:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 35aab783188248dd80000fc2214f345e SHA-1: 9ea606ce75e9cf990307a3da81fe583bda330c8b SHA-256: 763656ff41a61d6a2ead31390490dbbfc359ac6b37f619c13b0fba6d7cf03dc5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites or phishing pages. The presence of multiple links pointing to WordPress upload directories and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

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://coretry.ru/uplcv?utm_term=tanggung+jawab+ayah+terhadap+anak+laki+laki+pdf PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f9b3c39b7---42289343162.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/22608043059.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b460230febe---33204040445.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/36226380337.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/h0b671dk0agt3hnq2i85jbitp1/82037326156.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2b3ff163d---6558777299.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/rijikenetu.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/wereridafanitonuvamelij.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/19753424818.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/42484814927.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/sefesewoxebuji.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f69ca436e0---88179687181.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/jarukujexigibugax.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/faxagesevozew.pdfIn PDF document text
    • https://85097781.com/upload/files/mikapumojawidoditawum.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/buxenevikatige.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/kutoloximiwawo.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eded4f1a375---86915645642.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/88cb606783814730a45484dcd280c6e5/52827188393.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/35855979793.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/431a7fa8b7d177ea9763b9afef3766ec/85026597332.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/5241795469.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/10640541258.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/ralimi.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607796ad24c0a---88699239220.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013df9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13DF9 29400 bytes
SHA-256: a5f85cde38ed434b0dbe4dfabb57a2af3538e6a86ca13fa3ac2ddc22d81152fc
font_00_sfnt_off0000f950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF950 11112 bytes
SHA-256: 8345526565449d81b4a7646d10b4fd748f53501ce4674f70a63470dcee9ec8e0
font_01_sfnt_off000112c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C5 16684 bytes
SHA-256: fcd8d75f6111518200bb6e081e745ef1ff604689362174358f9d9bad71e42b94
font_03_sfnt_off000173a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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