Malicious PDF — malware analysis report

Static analysis result for SHA-256 795ae07880ffe3f1…

MALICIOUS

PDF

74.5 KB Created: 2021-06-26 09:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb434255b898a575c87d9a1d2e25ae4b SHA-1: 4cf1d056dd43b98265760d7f332da5af3f0f8ef7 SHA-256: 795ae07880ffe3f1036d0ccc66521b0b965a1c33b8f7840a222423de4aa9bacb
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for malicious content. The PDF's structure and the presence of many external links suggest an attempt to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d25982bcad---nesuzilaketejepa.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609496a8728f9---lukowakusogolobitedoros.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab62d15a1cc---jafemedasudabipeguri.pdf
    • http://datavincity.com/uploads/ckfinder/files/wuzowajojawudirig.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/d83b9b8381e648dfcad77b695ff7a8d6/34590179098.pdf
    • http://hndgyl.com/v15/Upload/file/20216251323426576.pdf
    • https://contactfm.be/userfiles/files/5632653561.pdf
    • http://littlepearlbooks.in/data/eimages/file/sepenipiwo.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/786f7e84204ee3242d0e36380e48185e/23929012281.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607544b1f2906---wadalenuxixiso.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/97773018885.pdf
    • http://beiwendq.com//data/attachment/file/pawuboxovuvu.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/5bf967291c9f081aa461da008b0910e7/78159969851.pdf
    • http://centralgiving.com/media/userfiles/file/naxigetiwakowetesusipedan.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/fnite3tiif03bpmghig0e300mq/78310689.pdf
    • http://hainescentreasia.com/images/file/93379786255.pdf
    • http://barcelonasixtytwo.com/userfiles/file/16450614586.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721f0672985---82769801856.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f6ba44f07---72325079958.pdf
    • http://sdds.be/userfiles/file/65971827274.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160736b5c6ef8a---tafupado.pdf
    • http://studioagronomoserragiotto.eu/userfiles/files/7157032324.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c978aaad11---vugeravekelo.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/g2qo3ae8etjml6lkslq6oi3dg1/23695412042.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=vector+mechanics+for+engineers+statics+9th+edition+solutions+manual
    • 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_off0000bec1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC1 16792 bytes
font_01_sfnt_off0000d6d8.bin
d716444de92b007e0d569ea9436f7d50a3a4a4e127152ace3f37dc8cf6a2d991
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D8 11160 bytes
font_02_sfnt_off0000f097.bin
4632d847ba3a0e2bfbae7c6013143228ba9b8f49ddf7ce9998bf3a1fac48eba9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF097 16756 bytes