Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3c9c854e180837…

MALICIOUS

PDF

87.4 KB Created: 2021-08-14 04:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c5c2c8b9f33ccde46c5dadbc23bd2145 SHA-1: 04512b540a18112b60adcee7e668c3ce3bdae303 SHA-256: 2b3c9c854e180837b562b557229b9e78dd97f74691aa89211fbb851ed6aafc07
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, which are commonly used for phishing or distributing further malware. The PDF structure itself does not contain executable content but serves as a deceptive gateway to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/68131874914.pdf In PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64479d0a99---vabir.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/39791987465.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608693c3f13bc---jadebinamotilegejobad.pdfIn PDF document text
    • http://zuche0551.com/upload/file/bufetotinagolava.pdfIn PDF document text
    • http://gsoutreach.net/clients/e/ea/ea4f28bd0b090870cbed8536b6d1d406/File/62618347400.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/54738796119.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6d76b4ebf44b08f3edb4d4f8a4590538/42054987385.pdfIn PDF document text
    • http://franckjuery.com/ckfinder/uploads/files/wuzegutu.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/84195073261.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/4l0nkrr81gpk7ubra83a84ugi7/45546174661.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/zaxexo.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/jmve7cqaeugqsookk5liliq1dh/82739168508.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/226a77d7bc26e2bf6d90fb6b2629af0e/12264274162.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/dogidajitixorefozudazesa.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/qo1esp2doctkdrrub6gjlagk7s/fafidaf.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/wadifimurujipupoluvefik.pdfIn PDF document text
    • http://premium-h.info/files/files/18114006863.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/85071760679.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/74578655984.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b18ce94e6---68513423393.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071adc5d9dc5---jonaf.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6838f702ff0fbdd8faf3606b374afcf3/47824443948.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///24935368746.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/99411441721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+change+keyboard+switch+soundPDF 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_off0000efa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA5 16952 bytes
SHA-256: 4593451d28fd5ca9d0e25e12fc5b76818e0ab6088162e766521ac088d2377b01
font_01_sfnt_off00011bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB6 11128 bytes
SHA-256: 929280afcea3ce70590990088a18f90de48ae34b68949a095ad41e4832516786
font_02_sfnt_off0001357e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1