Malicious PDF — malware analysis report

Static analysis result for SHA-256 593c5845ca02230a…

MALICIOUS

PDF

87.9 KB Created: 2021-07-06 05:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: eae15f870bb5486b461d4957115fdd11 SHA-1: 2bec5a7138324823bb18a6b1a7b8470d9fd9161c SHA-256: 593c5845ca02230a981adeedce3b9b57d13fc77c5b0346e0f497872895946a96
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, with several pointing to compromised CMS upload directories, suggesting a tactic to host malicious content or redirect users to phishing sites. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

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://communeouchamps.fr/userfiles/file/zubozivubagi.pdf In PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/gepajigevopimazajasati.pdfIn PDF document text
    • https://hirurgija.me//files/10470407547.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f75f66f0cb---79382749376.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bb388f76d---magejebewimiletivujapita.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/22010707536.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/zolelebokakegidebuf.pdfIn PDF document text
    • http://geose.ru/userfiles/file/zaniwuvekagunisewazenudis.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7d0ed2b62---wedaxolorigurarabipuk.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/36095813012.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/lmm66m8u96lhan8v1ju24evep5/zojabevegugirefetonumam.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/vajobixeguzitogitu.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a551b0be24f9a1ee8d44d7a2c4dc2a4d/93129112834.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4751f0c2a9---vigiponisej.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/pamotos.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/dekodemirifukemasogijen.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/1p7673bgdqqqfckeir4kemf51s/61259085271.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98371aa6d---97992044291.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babf9c57129---zepibil.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8c145097a---45401032082.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/8605093670.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/4c53e5861620f27de02b6bc738647488/gabujibures.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/51065376285.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079309f6ba7c---naxeta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=enchanted+meaning+in+malayalamPDF 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_off0000f452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF452 10524 bytes
SHA-256: 25a4533cca3d1f4e3b9df47c29b3c8305b342068943c4aed30b1a6074a1f5b6a
font_01_sfnt_off00010bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCD 18492 bytes
SHA-256: e87a3fbea0e91fbec76d8b133fdde12942e9a0152ad47776e72099be424b9513
font_02_sfnt_off00013a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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