Malicious PDF — malware analysis report

Static analysis result for SHA-256 571c1a0ef863215d…

MALICIOUS

PDF

102.2 KB Created: 2021-06-30 05:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e0a3dc0d5ea5e25793a9197179bc7629 SHA-1: 9384d4ca6e8082719b7f22fe7b85fc7471c944cc SHA-256: 571c1a0ef863215dc585170731d164160714421010cd8b4677a097fae158c9a3
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The presence of a 'download button' lure further supports the phishing and exploitation attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba163ca7e13---35511417503.pdf
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/37308026375.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/kalarevo.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f53b181b45---wirogotikabifojapoxudokun.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/u781l01pc92fm2394jccs9kqb7/ziwonulesamowurapazoxab.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9c9b91358---gopegesudulopipif.pdf
    • http://humanitool.ru/userfiles/file/13381272816.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/1202e6e8d5835a807d8bff08e4d84f1a/telibak.pdf
    • http://kayapaliinsaat.net/file/26171513721.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16099cbff47bf8---76467341488.pdf
    • http://learningkey.org/userfiles/tosoveba.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/i9a4qaetoacl63qn158b4ubmei/kegita.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/d409bbc71f83eb5a604f90563e5400de/62406779593.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0022127c58---73416783174.pdf
    • https://bmw-zona.ru/uploads/file/24040643483.pdf
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/93740975372.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2e5ca33d9---zesumamefimolokalabez.pdf
    • http://allasclub.com/campannas/file/56079033379.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/s83b8og7ee9fjqhjrec3hubn7s/sonemapexoxa.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ikmoq42a4mmjjkfcnt8g2s4u95/99667568068.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/e0iq8ntcd30bksp71oc1pbunj6/74865593900.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e7c3f1afe---68752866840.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/celhfdd060r3paf7itvfh0j2r3/fisuxawobizibixit.pdf
    • http://poorclarescork.ie/images/juwurepobapu.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/dca4039c11de4ea2524dea9e8076ad97/24117263015.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=nfs+most+wanted+2005+full+save
    • 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_off000127dd.bin
ee3cc66d13af7f0dab2128e272099408278f358234c2398df668fe39a3288a58
pdf-font-stream PDF embedded font (sfnt) at offset 0x127DD 10928 bytes
font_01_sfnt_off00014166.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14166 16792 bytes
font_02_sfnt_off00015978.bin
3eeae0dcb2c128d67ee996d9f9031c333483620d8674c2b9ea5d3613305d4057
pdf-font-stream PDF embedded font (sfnt) at offset 0x15978 18932 bytes