Malicious PDF — malware analysis report

Static analysis result for SHA-256 0376ca72e3cf05d8…

MALICIOUS

PDF

117.1 KB Created: 2021-07-23 12:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a053397861931e1660dba03af66d3836 SHA-1: 10356c22f1a78e5bf0a28713dc8f30ab1757b228 SHA-256: 0376ca72e3cf05d8c9295a90c17bca845c5eeeb5cfb16a2e8bc545c85693c000
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7a3cdb005---rigarimixasezoxotopawa.pdf In PDF document text
    • http://veterina-hrib.cz/user-uploads/files/34502272741.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/97621811797.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/707b98af760e9851ce0e61237f59aa2f/bapaxitilinuxomosesira.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf396709bc---60198739842.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/8d6d76242567c9c660262f105a4d69ca/87380148436.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce690325144---buguvedetanuf.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/tovarenes.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/29db0966b0c269188668971aafa3ef46/valisexowuvozutosakosu.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/wamutanigoralafugaguwi.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f96bdd9bfb---39644453387.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/2fk1urmvocmkmtc1fm8t7s0tl1/tudotidejodatoviwadav.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f67981ea2---tibixo.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c70e2b3fb---90849183013.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/97991081252.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/xenagogitejujak.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/kesawoguturidikokaseju.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/c1a270fbbe09a22c024eb38d7584f3b9/79956595745.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091be94bcdf4---lixewosamaralediwigewevid.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/e25e0d6153ca237cd46faaf9afdf151d/bolidebumomowuxefomibiper.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=eros+and+psyche+full+storyPDF 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_off0001686a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1686A 17300 bytes
SHA-256: 4c9f4b2b83501e3dfa71753e72d6248a180f544bbb5301c20be310c95a78f6f5
font_01_sfnt_off000194f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ad0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD0E 10824 bytes
SHA-256: ef0591a29cb0e482a802eb55a35bda502ac7fd6a89fed63d9e2378615b76677f

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