Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52cda351607cdd3…

MALICIOUS

PDF

113.7 KB Created: 2021-06-27 23:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3da49852762ddf6b5ddc22e041eb1530 SHA-1: 29fe3dbc57b37ff5b60e4b42903aa19e8e6e9db0 SHA-256: d52cda351607cdd3055bb1183fcbe69244a351deb9d8b3e6a7129b723d636a8d
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload storage, indicating a link farm designed to lead users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://jinistudy.com/_UploadFile/Images/file/10341288198.pdf
    • https://decoveinvestment.com/userfiles/file/madof.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/5d46d25e4a6f8b8ea2905d303f1fe5b4/duwepifal.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/8f0a22c1087f699f175b2f9078f9d877/88036479903.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f10fdf83900b609b27efd21c1fb4613a/22652640565.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c64824e4e6d---90760028479.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160809e8f45d16---poxewitazedaxefiwel.pdf
    • http://odnoklassniki-files.ru/images/uploads/files/73938794312.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/5446b4aac5a587d0443a96210162e95e/lepepijax.pdf
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/f50c9bce96620dd27d04950c165d29e6/sepefopos.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b202966c2d---31444289308.pdf
    • http://softwarefactory.nl/images/file/lunujuwe.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2a75e956a---bodirenarawanigufifuletid.pdf
    • https://underworldgear.com/upload/users/files/87302826087.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cded9bab9e---63859098828.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e8588b52f---7585083214.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa3e88163ec425de870832da656988da/95159473706.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607451b81885c---51244117528.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e0d7f2e11---fesatujagemujuza.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160866c3a69aec---49304829875.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088c52eb4f4e---joxevokuperuveginizariwas.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/9528988f8606df2ec69aba035ebdf6ca/25074352631.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075a7eb6f39e---6451942240.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/368b9dd15933f9e2cd0da0b2d8259fff/48570588317.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=glibness+in+a+sentence
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015cb4.bin
1802b68b47ebf87d493004883accb5aff1d70e2868258a9a4eceefef39e269cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15CB4 17544 bytes
font_01_sfnt_off00018b14.bin
90e42259c5a77ba106681ce1e6283a8cd0e40773b29471c47a1746a14a872f81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18B14 10184 bytes
font_02_sfnt_off0001a205.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A205 16792 bytes

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