Malicious PDF — malware analysis report

Static analysis result for SHA-256 4788d3fd3b629419…

MALICIOUS

PDF

80.7 KB Created: 2021-06-27 01:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2c6f923ff1ad9d86e3618aa33a23cbdb SHA-1: 404c833f054cb25914c47c1a04bb80edd32a4f54 SHA-256: 4788d3fd3b6294194b00ad5aae7cc5afed3736fe8119f13a2537fb1ac6772d38
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to various compromised CMS upload storage locations, likely intended to host malicious files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial gateway scanning. No scripts were extracted, but the presence of external links and the overall structure suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/1d6153be184d7b7c19142d870b8e7451/81172318971.pdf In PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160759a36daa11---47897490415.pdfIn PDF document text
    • http://kasargod.net/uploads/file/8517322634.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bbomdr771c5fim4ifv47bkkti2/niviz.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5107b4cfe0---jamujusubarabimogek.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/70139478431.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b90aaaf4c2---6377207666.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/47585aa5a01cb3e724e13f32f9dc027d/16119576494.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/lidamapagosej.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/d477ed23a6e04713a86872da5fce31c9/wilafotikaduzugadiwebomi.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/76464105410.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e28604efb---wizemedimevi.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/skq4qb67sl6fr9iijouqsmf9c8/74323873937.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/dumodewotuxalikemubogozul.pdfIn PDF document text
    • http://coclub-us.com/ckupload/files/21316548177.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/601vdfoojdcvllqbth8id2ampm/busuzawajexoralefe.pdfIn PDF document text
    • http://tulga.ru/editor/files/tejopetabakizumubizimisi.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f2bb5965b---pajomubuzepiwu.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/82455686229.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d042dd522a---56069078457.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/2bcfcf56f824c88d19a034e231e76326/mazixekuxasewaniz.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083840946d27---89399908925.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/9rkps5us2r8a2dschee9lqmbt2/sowunowukogavakajunililus.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9ec692278---88116725948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=convert+heic+to+pdf+online+freePDF 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_off0000cd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A8 26292 bytes
SHA-256: 03abee1257e46ea6bc69396a7d7f1cf8ffeb56a4016ce24732fa8fef0748b4bf
font_02_sfnt_off00011d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9B 10484 bytes
SHA-256: f0f5d9f36f4027245579f539569322d1bfaf22f28f585f9f487385ea1aeaddf9

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