Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aee42a997289957…

MALICIOUS

PDF

71.4 KB Created: 2021-09-30 17:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8db543b52645c730dbd5a4c1307231af SHA-1: 85c9d6c7d98aafe7b48aad00c63609c6985a0845 SHA-256: 9aee42a9972899573e12975ea99794b46e0776c2f21b0b6d58a26dc2e9eb4cf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=airtel+pocket+tv+for+android PDF link annotation
    • https://editions-tlp.fr/ckfinder/userfiles/files/73301304571.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210901004822947889nbaow2.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/99419115867.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/pipedisewasafilenidef.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/bigimavifa.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/66436767483.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/47181307498.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/xobobimepoz.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/f80c7b172163cf3670c6dd5c34e72f9e/mekewijorojivisis.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/fewur.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/80274060712.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210922_062202.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/94174887039.pdfIn PDF document text
    • http://ore-processing.ru/d/files/zowuziwokapolunidinoxeda.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/paxajekozanopowerubib.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/62048069060.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/fobokoxuzexulikuke.pdfIn PDF document text
    • http://pileki.com/imgup/file/meruvedinidivepuvifapiv.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/nefoze.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d2bf50ca07ee8035cf641e3c80bd3dd/tagikilaroburilewefeti.pdfIn PDF document text
    • https://papiratisk.cz/soubory/berusalemugelovevutuwe.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/tagudibozedubasilanatuxup.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/jovojuj.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/5da2i1hc1g9prqn3drab9nhvva/kawude.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/detatexi.pdfIn 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_off0000b516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB516 16672 bytes
SHA-256: f271c3f5404bee970ab27b33c0e7707cefd0d551513486c515ded7243a5427c5
font_01_sfnt_off0000dfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA9 10584 bytes
SHA-256: 097fae9cb03abfca59f653012455c2a34058ca6f7c225b24f996fbf06b56e92b
font_02_sfnt_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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