Malicious PDF — malware analysis report

Static analysis result for SHA-256 e893f1b806ad4544…

MALICIOUS

PDF

80.5 KB Created: 2021-09-08 03:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a9a4d5464f0302714b1b03ba6f88fb8 SHA-1: 2409b4ba4bbeaf078133d74a022e20a1b763c314 SHA-256: e893f1b806ad4544be72adce16e9a36eadf5972ad6cf06aeada735d5cdb4c3b9
156 Risk Score

Malware Insights

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

The PDF file 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 various websites, some of which are hosted on compromised CMS platforms. The embedded URLs suggest an attempt to lure users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bertrandetgastineaudesigners.com/userfiles/file/34372594415.pdf In PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/20049057593.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/43658068482.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b206a4db27e---xijewozokibusotesubajof.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/seduxaruripepujomu.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160839d76628ec---kijixojozafekaji.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085905b1faf3---gujasabovunutijut.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/95226819961.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/zibuzubawutinojaku.pdfIn PDF document text
    • http://vejwun.cz/images/46705361155.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/87307541647.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/9e2mp5q1ad477da3lla8d3vc9e/jutarosomafuwafato.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed0f6014cc---zilaponapolututuv.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/5uvd0qq8b9ago60s8b8185d4n4/95339349281.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/nusaje.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name//files/8405950068.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/zazobavozojubafukine.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/74669524296.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/a9ee01b2521cb48b6ad869fdaa0dbc02/87112650106.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/9505ad5b42bb263f598d89259d6cbad4/61561084878.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec96929914---lijajapar.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42a2b9fa81---10384007917.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/xaduromarowejaxazijiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=mining+supplies+company+profile+pdfPDF 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_off0000d537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD537 17988 bytes
SHA-256: 4348cb51cf5247fec06f0bc4052ad7bd1d14d1840064cf49cc73863201ab5b7a
font_01_sfnt_off000102a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A0 11072 bytes
SHA-256: e4689ce1ca6342cfdc60cbdbbae7ba0b31efb2413f2fa7cd1354202514737eb6
font_02_sfnt_off00011c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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