Malicious PDF — malware analysis report

Static analysis result for SHA-256 43060b0bb941bbbd…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 20:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2d30f5c206fed2a887fdac42a8e585d6 SHA-1: 98a47773f5267d6491d93ae59fb1c3c27442e039 SHA-256: 43060b0bb941bbbdf70e59e2013a6411bca9c2d9d0634ac3630d3b11417712a9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits malicious characteristics, including links to compromised WordPress upload storage and disposable hosting, which likely serve second-stage PDF payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607796d165671---jomawepafipiz.pdf In PDF document text
    • https://beruanglucu.com/contents/files/19510298687.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/23297707385.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/691fb990f6e4a1443dc4668414b2b487/38583256514.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609867e43edcb---jexopope.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/munasakiluxafe.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b9259a1a1ca---68509125349.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/c78579pmratpqnt54km66vd6gu/najalikikefax.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/r9fp6q3f96t4c2n91ukv7gait2/loruwezoru.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/55945c0c7177f2959213b3e21463f259/woluvarakoxufise.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ef77d301d77c51a143c60c029ffa7438/wazelabafotemir.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/nopawib.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/lt2otp232ntlrdua4ru9etgin3/27926709790.pdfIn PDF document text
    • http://nipissing-lodge.com/clients/b/be/be32fa5c9d1e5a871f1efa0d35b29fe7/File/55078741841.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/31830529156.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/vuduzege.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/rorakiropuwaluzaviloge.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/30258280510.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/61670866497.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/83adl00pkrkh2hfjrgb0f1jsv4/24010829519.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/4b403c39d39a34a8440e7c4e86d41249/pilevumukozexomuvaja.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/54691165918.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/vebirawepatasadid.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/16562733885.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/93747932500.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/pifusawumof.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/junupopudakerosapovizubaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=let+it+go+piano+musescorePDF 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_off0000df38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF38 17916 bytes
SHA-256: e00bdff7a9bfdc2718860e2041a546076a331d93ff6a2f960585e0715584da3c
font_01_sfnt_off00010d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2D 10728 bytes
SHA-256: 2b6581f3d2de883aa08afa09cff4141d552fa9f28b6960a56ceb726d4f50e291
font_02_sfnt_off000125da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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