Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ad1652b6d60709…

MALICIOUS

PDF

86.0 KB Created: 2021-09-10 05:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b3edbcee7b1ab40e96dc2649a3a902ef SHA-1: b90d4107da0d63d066643ae177d61421082dad1b SHA-256: b2ad1652b6d607099d0b8b89d6940a62d26f3352184b8290abf0fe241e5477fd
156 Risk Score

Malware Insights

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

The PDF was flagged by a ML classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to numerous external URLs, many hosted on potentially compromised CMS uploads. The presence of multiple PDF link farm indicators suggests an attempt to manipulate search engine results or distribute malicious content through a network of disposable or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://eugensa.lt/app/webroot/uploads/userfiles/files/xelisegukudododa.pdf In PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c66cb137e---47368407344.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210905052415.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202108311745497689.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/50045711623.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613655d3bdfaf---63738532115.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/26510482060.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/46523275339.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613716d50dad3---39783292615.pdfIn PDF document text
    • http://teakdeck.pl/files/file/72913838025.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/razame.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/vojozena.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136d6db2d8ea---83730403834.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210906/file/16309649497906.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/69872907996.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613798e0c3fc8---36715971917.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161332ee4def71---kubotejewixizalufenubesig.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/3887534053.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/51288867281.pdfIn PDF document text
    • https://songhong.info/userfiles/file/migud.pdfIn PDF document text
    • https://dellrein.ru/content/file/xadilad.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161368a197b78d---rotitizilefu.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/ramikiripopimoxorukulid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pokemon+games+on+ppssppPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 10352 bytes
SHA-256: 5733cb51ac0e7d2d3d09bcff7f1ddd14e6b470b002da87ee09c54d65f85c9c56
font_01_sfnt_off0000fef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11703 19660 bytes
SHA-256: 3733b717a7826123d39e2c901eaf625e5bcdb134fe363fa1751d3271af6155f0

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