Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d239e0b0e77891e…

MALICIOUS

PDF

69.4 KB Created: 2021-10-01 08:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 00825e8082a5f18b2af7a5033aef802a SHA-1: 1b21dbe44f9f3786fd389e562ed89f9105cbc4ee SHA-256: 6d239e0b0e77891eb35007e4777fcdbee00ebf31daeacbe22e5cfdbfe1bed8cd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The presence of compromised CMS upload links suggests a tactic to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://gemwishrs.com/ckfinder/stones/files/83732323138.pdf In PDF document text
    • http://jj-metals.com/userfiles/file/2021090306250473499.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/84580639664.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/633387dcd3039800e215e650310b95ff/jemati.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/bimanofojakujilusuzujem.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/20175828836.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/busonulufedenap.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/56263442934.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/75308086361.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/78728392152.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614225a2c4e58---zadipimipibunefexipofibov.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/xesezexija.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/93643795186.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/18808941952.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/kixesevamimoxofanib.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/17166635613.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/84087734157.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/88365312638.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/10436998496.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134166db0092---35807606159.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/legudinixorusesega.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/59889023431.pdfIn PDF document text
    • https://rjpexport.com/files/metubenuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=dr+who+villainsPDF link annotation
    • 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_off0000b22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22F 15808 bytes
SHA-256: dc5caf7353040fd27bc322daaa85391f06a276ae73520ac6937dddb36b4b8a07
font_01_sfnt_off0000d9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 10128 bytes
SHA-256: 28be51f8ea13973cd7c02a14b812ad8358e26cec39dc08855687327e952b5466