Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e8304ac8f5aeb5…

MALICIOUS

PDF

88.5 KB Created: 2021-07-03 10:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b07cc14e8255fd2a8c1f32cdcea3d3f SHA-1: 9639d4d2e14c71c7a4006b97e9c4394c89e83bb9 SHA-256: d0e8304ac8f5aeb5bc41c3f5be0692f1e64310681d2b906c8dfff59391ed73df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=what+is+a+raging+bisexual
    • http://sakuragiramenandsushi.com/uploads/files/zujeduwaz.pdf
    • https://airflow-skateboards.com/upload/file/duxusasugidubisub.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/dff5728bdf25dfd332748cdd79f935b2/sanubuwawotawor.pdf
    • http://finproekt-msk.ru/userfiles/file/povigivumiwe.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3061648fb---wufimixizugafuliwolimat.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609071fb8a406---fejajaxavem.pdf
    • http://akinmedikal.com/uploads/file/23523620943.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2hhtgiv80pvuj2718ddqrr2ov6/17627635420.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/q9ci7rljjakpm1r711geqhh734/pesobume.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/dd1129cc2cbe96b7f13f4e34f595b526/kanederiwabezaribotave.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/jstv2m9mlq2mjj42h5osqckqo0/5718418980.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160814a200cfb4---vuxoxeturexirugubafokaxi.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/94036997416.pdf
    • https://puntoagricoltura.it/file/25736119436.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adfa696f65---1741415377.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/d827d8917f7cb97220876f3ac75cc340/kanemiwexatifuboret.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b568ec22f0a---lulafozaroduwagagagaxeb.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795e9cc850b---turubofot.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/89c41a14257bda7de9692f26c8799c66/fokit.pdf
    • http://www.almansori-ye.com/almansorifiles/files/4920256173.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c7819dc4---timem.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606cb330e5248---tajufavuzeg.pdf
    • https://bititechnika.com/uploads/file/32233513188.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 16792 bytes
font_01_sfnt_off0001071b.bin
c697285b2236971c918fa9040a1b51ccebd50a3526f04af3384bb22c60997238
pdf-font-stream PDF embedded font (sfnt) at offset 0x1071B 10604 bytes
font_02_sfnt_off00011f50.bin
33a1c20f4c02b20ddb2aaf3d4c410972eb550a9357920466cd9752d9d2780a81
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F50 20332 bytes