Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cf4555410436de…

MALICIOUS

PDF

101.5 KB Created: 2021-06-26 15:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d345816d1e41ab7566fc12b06a29cf6 SHA-1: 72e69aa4556565149646ad943ed70ea6e1b70798 SHA-256: 86cf4555410436de893cbecbeaaf46c63679338a5bd6835de018683cf9832274
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://smidgel.ru/uplcv?utm_term=class+12+physics+electromagnetic+waves
    • http://jarosi.hu/files/file/39081672390.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/duwug.pdf
    • http://asupuro.com/upload/save_image/files/fadoneteda.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/39cf2c20b60154b158c9047fe6725177/vebevetokilijigawug.pdf
    • http://reclameindex.nl/images/uploads/96839993889.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160894dca0ae1c---muguvafebatamu.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hgu1ghmgn6fd6jhf9pnr0fbng1/finuxawofo.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a37dd3846---18314521392.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/dec477f03f86c2b73edec47c288fc254/5470444903.pdf
    • http://anandtouristcorporation.com/uploads/48897827265.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/f5e62ec63b9106e79b7a9d0f97ebef18/90818868961.pdf
    • http://blessingsngo.in/userfiles/files/6874715308.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/uk3rflfb12654mdialh9073dft/9310853823.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/2a743d6d44ee88eaeff54f2f6c516318/62815781972.pdf
    • http://elijasprojekts.lv/files/file/55997930765.pdf
    • https://lawina-radom.pl/files/file/luxitufikewokoxelod.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/qecafblq2d0ho4k75qa1igmrk3/vubukusuginiminepiwazos.pdf
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/bituzutewirafixisubomugi.pdf
    • http://maasmartcity.com/userfiles/file/83265519488.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/b804d7fff2a1861cb5207ce91b18c2dc/7020421398.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/faa4df14d6b5b9bad715ec04ebd87df2/6309371539.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608abd4e24b2e---liwavafasi.pdf
    • http://diysmart.net/userfiles/file/931731847.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fc6.bin
450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC6 16088 bytes
font_01_sfnt_off000124fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124FB 16792 bytes
font_02_sfnt_off00013d0d.bin
285824a8978a6a6f21c204ce988b8e9830ce3fd963679e686c6d83df60365398
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0D 18060 bytes
font_03_sfnt_off00016d2e.bin
baf7aa1c5746ecbaa7e5213d4032c6e39581a40b3389c54786fae3d801813222
pdf-font-stream PDF embedded font (sfnt) at offset 0x16D2E 11292 bytes