Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5431390018a568…

MALICIOUS

PDF

95.6 KB Created: 2021-06-26 17:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dba62d2e4d5f07147e788f92af987406 SHA-1: 3450c96d08ec4d7725328d36720a314640af3852 SHA-256: 9f5431390018a5684a80d24dbd19ca9a8ff20005c62e0ef4346855845d625a61
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to direct users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://asupuro.com/upload/save_image/files/70405640141.pdf
    • http://tipsclubcr.com/campannas/file/faxefusitelafelum.pdf
    • http://intergeored.com/upload/File/repoweguwekirin.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/81a23aaecd159ca1bffdb861ef386a92/26040348991.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090223f6cb84---45067747908.pdf
    • https://amitadevnani.com/userfiles/file/bebapevuduxasijoguxet.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d548d057c7d---81527879274.pdf
    • https://soosekszer.hu/upload/files/lasenego.pdf
    • http://immobilieninvestors.eu/userfiles/file/64547556332.pdf
    • http://elcampoeco.org/FCKeditor/file/gerapi.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090963729087---88081892001.pdf
    • http://abwlargo.com/uploads/files/20566097595.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c67f07bc2c---63249498068.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/941e3a7450d3753899897b800c1a69ba/55369937398.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/8ecca420127fcc9edceda6b522d57eec/78846508901.pdf
    • https://balustrady-metalik.pl/files/lesegopogutil.pdf
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/ravajijepomupejibev.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/7b77b016afce2673517a2f2bd9a7cb51/11950554915.pdf
    • http://mim2010.ru/userfiles/file/35015523849.pdf
    • https://kovtec.pl/eurostyl/photos/file/87800876763.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/926c28b162b4db7e70bcaf32728a4d79/diselolugivoni.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=business+plan+sample+in+amharic+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_off00011308.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11308 16792 bytes
font_01_sfnt_off00012b1a.bin
52535c539fad468c3a9ce955899fceab7c95697ea90eb58a90c761776584d77d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1A 17456 bytes
font_02_sfnt_off000158b2.bin
70a138692e6ccd3215082b3cfa0ff1b1fea3c98aa9ac305220065ffd0d2bccdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x158B2 10820 bytes