Malicious PDF — malware analysis report

Static analysis result for SHA-256 fadd9f339e054a99…

MALICIOUS

PDF

79.1 KB Created: 2021-09-05 04:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18ed20e6141805970c84271488cc2ac4 SHA-1: 6dcc95135dcbd707253c83edf1161d29eb5f569e SHA-256: fadd9f339e054a9980ca2c4c5e173a944d2ccca936b20029a80e7ed12e4b5f1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://gbagencement.fr/uploads/file/39437872702.pdf In PDF document text
    • http://pobierzplik.pl/uploads/files/kokin.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/29765938551.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4edcd8832---71593199304.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/93871789935.pdfIn PDF document text
    • http://www.puhito.hu/uploads/88715763292.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/fozuwalosezusisagazewi.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1ad9c427dc338c91b6d6072083a097ea/xuditumerapabafale.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/73219720737.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/961e9f28b0e3243d5260d0976a1518c0/latevujaxitiw.pdfIn PDF document text
    • http://innotack.com/userfiles/files/nilekug.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/pepajifemexisojepobom.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/vanaxuwi.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/76d52645c2bf20418a4d9cf68e72e2ca/61918098099.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/3e801801a972149007595a9aa5fe1b5d/somulumera.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/piwigofogaxut.pdfIn PDF document text
    • http://elijasprojekts.lvfiles/file/77016600962.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3453c98a0---24593149539.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/losanu.pdfIn PDF document text
    • http://redactron.com/userfiles/file/31415907511.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073d3ef86c4e---bugumawapikafavemi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083ecaedfb11---pabivuxoduzulawuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=dsm+5+manual+completo+pdf+descargar+gratisPDF 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_off0000ce47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 18084 bytes
SHA-256: f72abec69daf6aa68b8e519440cf05bd61b5bdad38e8f215195f5f33409ec557
font_02_sfnt_off000114b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B4 11200 bytes
SHA-256: ba628d6e106c59137cb915e481ca5c17e7d7d7d2e05fde8ca379ac083803f958

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