Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf963024f88621cb…

MALICIOUS

PDF

88.3 KB Created: 2021-06-28 11:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6db1aeb6cc5b1482d256d8056d8acd3c SHA-1: f0cec40fb5309c554d54e557cd48c7b979bc1bbb SHA-256: bf963024f88621cbdbc42f7ecfea756c41e5f3a7bf3f04165cb812d90fec2403
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and does not provide direct textual clues, but the overall structure and heuristic firings point to a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/485c55711b4445d91b390d38aefbfc6f/zaparagilukexoriwenowote.pdf
    • http://bocghedanang.com/media/ftp/file/33856120787.pdf
    • https://accuratesearch.com/userfiles/file/21768863879.pdf
    • http://birnagarcollege.in/userfiles/file/renekuxokexupox.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/baxeletijoloro.pdf
    • http://finproekt-msk.ru/userfiles/file/68814567418.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072d4e6b29ac---gulupowedisavasanud.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fca0828907---mozefawadewifuvaj.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/5c529327b740d7872681411880d75dfe/11591616308.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b411dfaa48b---65086752339.pdf
    • http://51www.org/uploadfile/file/dc5d89c23136e8e892005165b3d51f2f.pdf
    • http://automotiveenergy.cz/userfiles/file/bivirumapoxoxedexapexiwal.pdf
    • http://forglass.sk/userfiles/file/lirejonenabesizo.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073e27b9f144---93550482220.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/f1711ac727b100039422bd31eda327ca/satifemoza.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f95c2072---60289746934.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160747da726bc0---83286368883.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b86a8e48321---setufuzezoziduwujo.pdf
    • https://plasy.com/uploads/file/rotuwivizusedup.pdf
    • https://ecoretras.com/file/39222337119.pdf
    • https://cissud.eu/uploads/ck_editor/files/xeboluvixi.pdf
    • http://crm333.com/documentos/file/xejuxibizamilemapajidaxe.pdf
    • http://vandientuchinhhang.com/upload/files/5184377849.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4idcsk85o4t6uh2n3hl90g0fso/67858906792.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=it%27s+too+late+michael+chapman
    • 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_off0000f0b9.bin
d77c5e42930942a04f71263215cc08f6d2a59622af6735b246619358ed515672
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 19472 bytes
font_01_sfnt_off00012245.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12245 16792 bytes
font_02_sfnt_off00013a5c.bin
905c020619a46940dc0a978e33a8565297e157e25e3893e35993a35627ec28de
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5C 10524 bytes