Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ab57ad7ea32084…

MALICIOUS

PDF

87.4 KB Created: 2021-07-14 09:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 871acbc49e4a45db9735bf17f37d03e9 SHA-1: 277669d252dc4bd11cc70bae93110ef352d9e7b2 SHA-256: 87ab57ad7ea32084b396db1ce798122230db633e743c2c44ecc1ba8a6a8549da
156 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised CMS upload directories. The primary purpose appears to be directing users to malicious content hosted on these sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dec092c00e3---voxetodebetelevujusamitav.pdf In PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea1c1a9a2f---kukivurexoparaz.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c357d3668f47220d0f0e4d102a9b0800/47311340182.pdfIn PDF document text
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/jutolobefi.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b8167745d---zenikunerigix.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfd4026a79---92568038399.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/1c5968ec02008a2f48707b8834bcd1fb/78387464540.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/v1qdlg7lmitd2p1dtascejt9f5/sowirik.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/a14dc7ed91a8e2bb1e92d6963737701b/gigebulobipebebeloke.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/morote.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e25252a522e---50294008990.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/5393103026.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5087d7260a---julesosokumuri.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc84143cbc---petasipipimu.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb42109084d---kikaxawimatoxutubipu.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/vixilebemuwa.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1052c10e4---fezugazubowimizewinogugin.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160986af710758---zonijidavugaxo.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/winekusa.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6a033ef68---loris.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/dexat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=outcome+rating+scale+and+session+rating+scalePDF 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_off0000f269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 17448 bytes
SHA-256: a3d50a5f96e41edb779adb663d0a0a1752a87655a5f54067c14df6b9fdbf66e3
font_02_sfnt_off0001379c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379C 10836 bytes
SHA-256: 1cc96fbddcef26b3cabfb332ea6d02b309eaf00ad701fa0d4208e1cabe8f3eea

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