Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb6ba8d50c97134…

MALICIOUS

PDF

91.6 KB Created: 2021-07-24 23:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fd2aa254b8548bec02bae45024379550 SHA-1: 5611bb04ea9987d54595700afb8b0393f0234537 SHA-256: 4fb6ba8d50c971349b2899afbbd38d29ec1fa9508486d2340eb0124f53fc1aa8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to trick users into visiting potentially harmful sites, likely for phishing or malware distribution.

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 https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/3eb6efbd5876116bbd8b304799fe8e65/nuwilanetebunagiziware.pdf In PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/7a23046a73fed701347f74bb4ce70fa6/40371884513.pdfIn PDF document text
    • http://meta-min.com/files/zadul.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/50917344284.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/89394349470.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c0a68bb89---tidifi.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/uoevpnvi4scq3sq2hqise0upf4/rudigozowenabitikoxawitib.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/97010523223.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/guxixusizijisefosuforegi.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/72184018315.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/55713256242.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/adrok97a35fv37ktcjs71plrqu/nibefuvitavuvof.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/nevodalomukegexesajajor.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c172bf0ba47---29482669376.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/24367616482.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c463dac5804---gakobajijevitawag.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/42539367867.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/4368178656.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60f804a3497f9.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16075d22fd4735---dosipekapepase.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/vogubabolujuvufut.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/7251925490.pdfIn PDF document text
    • http://12shio5.com/contents//files/1383526290.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/54519528637.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719f531efe5---97444668377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=request+sample+proof+of+employment+lettersPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c250c83983955526629049c0be4dc666/17240307363.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0D 10832 bytes
SHA-256: 44e704cd4447d5fdd35945802835dcf07671dca583fc1b1d866dc74493f2696a
font_02_sfnt_off00013415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13415 16868 bytes
SHA-256: b2a4ed8ff7a90bf4ca4ed1246fb41a535949418d8e42da2da17074322ebe7332