Malicious PDF — malware analysis report

Static analysis result for SHA-256 c672108d7aad083a…

MALICIOUS

PDF

84.3 KB Created: 2021-07-24 16:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: cb509b77cebbfe7d383a141d13e3ba47 SHA-1: 3a5a3ff8c0e51c3eadd3c9fffa43466c9f132fca SHA-256: c672108d7aad083a08fe3ba7a6898cba475ee4a90ad4e455736d31bfb2a50870
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6b15772ed08cd29f30ce076274a4fa5a/tiwipaluxerazelape.pdf In PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a57645008---tomojuxegadagudalozo.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/5e99edcf328737ba4e0eb2000afa8a36/fexaxog.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/24390546077.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/28571881402.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c02348462c2---73782472389.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c535684d450---92354261599.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210609030131.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/fc1mo55gcs6jli5b19v7b1j45f/23667043641.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac654d8593f---kavekofobemewetezisitukaz.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af2e9223c5---13855773926.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16070a484ecca2---84497986820.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/73384680662.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/saluxa.pdfIn PDF document text
    • http://cbwmd.com/uploads/Files/10552602469.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/banasadakoka.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/kuzivuzogofuzixomigo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad94d5b79---dupesisad.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/tozovejizataxud.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/dalipipunabarofevegawi.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/32119354999.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb7be406e7---14612557240.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773b3a6dda1---72515547557.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/62869945650.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3b78df311---48720226895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=plant+and+animal+cell+venn+diagram+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_off0000e4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 17084 bytes
SHA-256: 7a71e36bd105ac96d4fea06f284db6264a6317534329d35f8d7a0dd1c6f1c0fb
font_02_sfnt_off000129e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E8 10740 bytes
SHA-256: fa194af62eefd95840902c62f81246f09788dd2f0e8edf1fa7d159384d52c909