Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec9e1dff2a85774…

MALICIOUS

PDF

111.9 KB Created: 2021-08-16 03:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 603dd84eb46616479cb09bf76220b128 SHA-1: d57061be8eb2247d4854987eb47358d3f58111e6 SHA-256: cec9e1dff2a85774bfb9feb9e98a7451aa1389a7d7a88e3d909082e35805168b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://dzstock.com/Upfiles/file/56427028620.pdf In PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf30e82cb5---zisopalomafemeg.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/gagewotametiwukujupoz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c71761251c---wakekevemi.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607678ab9ef2c---55923719814.pdfIn PDF document text
    • https://abeess.com/userfiles/file/9386563460.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b69adba87f3---wufita.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/tajudajefesimuso.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/26133711357.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/zimuvagirepumis.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/milaxafoguzuxuja.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2abc5f83a---2609396614.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/61f90067018d5d8492696d93b3c88b1d/97568291052.pdfIn PDF document text
    • http://mobilenmr.com/files/files/53238601658.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/49ca23270d030bca531523be2a4f504c/20814289293.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/tokezojububuzeped.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607af7e5c0d48---bakilajak.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/65915469353.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/22025752559.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087e7570f6ec---80558658299.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745070a41d6---26179745512.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611655835b74c---34404078343.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160825681557a0---78963039411.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/92060119578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=atomic+structure+worksheet+answer+keyPDF link annotation
    • 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_off00014eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EEB 18700 bytes
SHA-256: 110e827f54159a4e590c912c8be1dad4bad8f87c844cb0cf0466b364e6efabad
font_01_sfnt_off000180db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000198f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198F2 10824 bytes
SHA-256: 233dd6b4337ad6b08aff652af033ec5dcb3a22279704b4817e08bea01bf366fe

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