Malicious PDF — malware analysis report

Static analysis result for SHA-256 1529ac5c83ed0e4d…

MALICIOUS

PDF

70.0 KB Created: 2021-09-03 23:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fd21ad8322aa474c5bfeed7b7611ce31 SHA-1: 50fe8ad6a3c05aee5ddd9913b20a769499506ebe SHA-256: 1529ac5c83ed0e4dff8010c55ca83eb9f97c33bd4653b064cbb2731ff2936733
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting. These links are likely used to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pistant.ru/uplcv?utm_term=causes+and+effects+of+the+great+depression+pdf PDF link annotation
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074328634a08---luwikagexure.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/pevibok.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/dikop.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/56cc70ea619d73a8c9e765bb64cda6c2/88802475820.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/fifonuzivuvimivomupot.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8949f5611d---lovumezute.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/22078722914.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/330afba6583ce4d53e5e9244de626a8c/nadajaxuwuredep.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/sugerakimojagadetigovigid.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160833e45928d3---13348058140.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/fuwulajowininelomixerebus.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/gemigafoz.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/67226814856.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a415f1f67f468d7d45cbde37c42c9846/bawitezijeda.pdfIn PDF document text
    • http://d4sontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/3997795819.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/48b1c86b47bf79e0e5b69e1b750fb4fc/wijuzikefegititaxol.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d5d773d5b0.pdfIn PDF document text
    • https://j26clean.com/upload/files/fujepatomuvafuzuzikeg.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/41124557853.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/b918c6d300b9e97981a14afba3b6f160/5118702509.pdfIn PDF document text
    • http://apothepharma.com/upload/files/sexufujanazexegaminezet.pdfIn PDF document text
    • https://amblamy.ee/upload/file/lizajabetu.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_off0000b435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB435 14728 bytes
SHA-256: c969e93e0ad637cf946185cb9cf1bb8d264749f0a399e8e0908d2602ff69e995
font_01_sfnt_off0000d8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AB 10984 bytes
SHA-256: 44591f1c9cee6d7ec2a4d78ed1d653539ea9d8a920115826e0d66102f085e6e5
font_02_sfnt_off0000f1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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