Malicious PDF — malware analysis report

Static analysis result for SHA-256 351a5e53f9215236…

MALICIOUS

PDF

72.8 KB Created: 2021-07-04 03:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a218d5d4365cd9bb9521f35e346dff0 SHA-1: 33e96fb8b784bfb19303a03c8c76d17bf11b119d SHA-256: 351a5e53f921523619d03f515ff4dbb082b9f970a4f89f2b7f3bf6b71055a2a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide readable content, but the heuristic findings clearly point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://keacg.com/upload/files/wepufon.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7e19cbdc3---11843040720.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f80b2ba96c---57297404343.pdf
    • https://astdubai.co/userfiles/files/rerefexakoxexofijut.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lpjiln8o4v8ps6iikoesofi4do/49033654018.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/63300872399.pdf
    • http://jinanxintiandi.com/userfiles/files/sadojugapukezugepotil.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/d637e4441e6c61bc5d972ecefb735de9/92944346630.pdf
    • http://chapelguild.com/images/usr/23491501526.pdf
    • http://artospace.com/pics/file/95425314962.pdf
    • http://adabaskimerkezi.com/upload/file/motutapiz.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/1d40fc90ab5eda809526fab1d25fce14/gujulagit.pdf
    • http://ithaca1962.com/clients/41687/File/rotoriviwilanubiki.pdf
    • http://tumwebthailand.com/ckfinder/userfiles/files/tokuru.pdf
    • https://lotteppta.com/beta/assets/file/kataxokuwemaforanuj.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/ef04232621598bfd12e65ebff6a79590/keniperokabiwobivanu.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb6697ac1c---fedenuvate.pdf
    • http://koyomisushi.com/uploads/files/6544998350.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/da9uccbdfgbsrfh8jn2b0vof77/23979101059.pdf
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/12322551760.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/m89fkkre27c7lc66beo6675g46/52934838786.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/b592939f67221b6a333d50e9449a724e/nonadelozovamewojinabir.pdf
    • http://aranykoronakft.hu/userfiles/file/33101628917.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=fam+meaning+in+english
    • 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_off0000bda6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA6 16792 bytes
font_01_sfnt_off0000d5bd.bin
21614e161704b1c411c5e9eeee9bf585c918e3eae7c56157d0431d5d5de41f34
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BD 10216 bytes
font_02_sfnt_off0000ec55.bin
0f01a050dc2a48cda1bbff18ed4bc548b977998ea333e965574f86eb70d29c2c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 16080 bytes