Malicious PDF — malware analysis report

Static analysis result for SHA-256 6150f5d2bc614b6f…

MALICIOUS

PDF

84.5 KB Created: 2021-07-16 02:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a41a5d03552dc5c185510b430081609d SHA-1: 041ce8722c298ca910332d16bee04da043884b5f SHA-256: 6150f5d2bc614b6f9a466f701ece1d290a4314e0436d3b6d73cf09afdb68db84
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised websites, likely intended to host phishing content or further malware. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/j89up4ec07prja36tsbet171p6/xitopoxepimivojejevafopof.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e52d95cdc27---23046209918.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/b21ad687bb63f56da905fda493df1686/19640283081.pdf
    • http://nowyhotelik.pl/userfiles/file/56155065554.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608efc1a57777---53545280383.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/8bddkqfn23jtii3hquige09ij5/42251601919.pdf
    • http://circuitvietnamcambodge.com/hinhanh/file/gagijatebakisekatowiru.pdf
    • http://nwatchonline.net/userfiles/file/46897768182.pdf
    • https://avflash.nl/upload/files/30037586977.pdf
    • http://balade-pierry.fr/userfiles/file/50079682584.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9bb9e6d92---40380493810.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ddd79c910---dofedosogibasiz.pdf
    • http://brmxn.com/userfiles/file/20210616230051_iyd5to.pdf
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f20783fa8a---tofikomebubuzotub.pdf
    • http://evopizza.lt/ckfinder/userfiles/files/61376809198.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91591e4cfa---ratapukegawosalojatagekis.pdf
    • http://telegid.tv/userfiles/files/wokema.pdf
    • http://biomehl.com/images/content/files/104646275.pdf
    • https://landatur.com/files/galeria/files/53820690902.pdf
    • http://dawahcity.com/userfiles/file/zikapuzunumepi.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/ktqjahl10fcdk0b7lmjheevut3/vemusakop.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/b2b3ae6ffd2578fe537febf4f393af46/95843993413.pdf
    • https://aquarell.ro/userfiles/file/40840042538.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/58384404719.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dqtovpfrihudgk8r1q5fvvssg6/61602859721.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/agco23a9e1r4eoudri9ecu5r1u/46197352639.pdf
    • http://friend5190.xyz/js/ckfinder/userfiles/files/12273212546.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=is+peptide+a+steroid
    • 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_off0000e950.bin
1db40f8533131595c02c8c94270fcba76cdf1c091fef7b668682e6a8c1fdc3a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE950 17000 bytes
font_01_sfnt_off000115b7.bin
617e29481ba12a1d97348f82289b1d094605ea972c791441859af143381404d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x115B7 10188 bytes
font_02_sfnt_off00012ca8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA8 16792 bytes