Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ea5c25788b70b7…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 20:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0d4b5e8f28006f283abd621c4f65b6f1 SHA-1: d010cc080124e722af4eb3fb8aa809a3ca9d5a42 SHA-256: 55ea5c25788b70b77e4883cc14934c26bead8a61d21319ec4479e0db8adb20b3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of a link farm is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://ylplj.com/ckfinder/userfiles/files/88388204331.pdf In PDF document text
    • https://eobliecky.sk/userfiles/file/remimitipunopolovowokofu.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/kusesiboresip.pdfIn PDF document text
    • http://safetruck.gr/images/file/senope.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/61567507750.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/13592075218.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/junubenotodumugudamifano.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/67205367687.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340333e0fc1---60389662244.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376d4646fee---gumudepunowijiloz.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/60087015056.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/34243267261.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317fcce1625---65589136420.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/fudipigidugukipividevetoj.pdfIn PDF document text
    • https://termofriz.rs/files/puvawo.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/balifogupoperifukunugulu.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613243cece2d1---nijovawaxuje.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/nijezimikisufode.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/raborekogixi.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/lezusudojofobapuroj.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613508ead0ad4---xekitabaxerulilivuw.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/dunajagelalorewuteg.pdfIn PDF document text
    • http://asvpp.fr/pdf/27893690393.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/fekiv.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/3272408415.pdfIn PDF document text
    • http://uhorder.com/upload/files/79888270744.pdfIn PDF document text
    • http://www.fotolia.com'&gtIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=excel+data+visualization+pdfPDF link annotation
    • http://www.fotolia.comIn PDF document text
    • 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_off0000e25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25E 10824 bytes
SHA-256: 9bcef45ce9c83e42dc0484a0c4771353cd584a892ea457ae5be12e9e80e83389
font_01_sfnt_off0000fb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001139d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139D 16792 bytes
SHA-256: 4a482569d101f04325c4554a5e92314cb726536c0a4b5ca3652f56a2fc84e78d

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