Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c094c200b4a252e…

MALICIOUS

PDF

97.4 KB Created: 2021-07-03 09:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 76d3cf4c3aae265fe8cb05f49c855d4c SHA-1: 31c8c0c993a1c83b96d01b7a0b24e57a7e72ad38 SHA-256: 4c094c200b4a252ed95b9dc7dfcd12a05f78a998b7178d7942a01ed6ef416f97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly indicate a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://chonburi33.com/userfiles/file/61958675106.pdf In PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad5c89f37e---9182160486.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5556ee15a---53363186494.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/10680076491.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/fecd1f06e798ef65ce4b52f0d0a3cb48/10040428870.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/49838206282.pdfIn PDF document text
    • https://clinic4lab.com/upload/ckfinder_temp/files/20210629004928.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/2ce6e224220166060ff0fc6437102632/buzot.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/b976b41b9632e149034c076a6684076c/pamatowunop.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/rivobuxinamo.pdfIn PDF document text
    • http://azizolace.cz/images/file/45236472462.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/fogln803jisdkvgigcm4r8rj8m/98268974538.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/mufenevipawedusilexupika.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fab5baa1---50403968894.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c3c08d1d5---joluvaguneziwoxabomola.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/jobugibujakatubelomed.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/cd35a5f45492622325c77b1a13cb0692/lisadewivoloxebakiguwej.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/86097279839.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad3917807b---93433713022.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d15f74b79f---mezudogexinafesisomo.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/61739791907.pdfIn PDF document text
    • http://fluidearthconcrete.com/userfiles/file/porosuwebunoto.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/28ef97c490d62ccf71c9a298ac37a5ef/roladedipop.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f29bf5b745---gozulobu.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/kimomogikulofojedikebov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=essential+english+for+medical+studentsPDF 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_off000119d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000131e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E7 17940 bytes
SHA-256: 03257517fe05cdd0a54e87e3d536fb31b460562048b8244ca2bc738793e28184
font_02_sfnt_off00015ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF6 11004 bytes
SHA-256: e7cd52696197343af6c65d60423c9a05889f1464f151401f2e60629c80ee433e

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