Malicious PDF — malware analysis report

Static analysis result for SHA-256 0686fdcacd7b7b68…

MALICIOUS

PDF

101.5 KB Created: 2021-07-26 13:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1a86c55de99a2b55c2e2f687d63fed35 SHA-1: 64997705ec3b54d587234abb5a77fc47ee45dfbb SHA-256: 0686fdcacd7b7b689e49df9606504e4672d99b43acc8212504afbc0a015a913f
104 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised WordPress sites, disguised as a download for a movie. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially malicious PDF files on compromised domains suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://karapinarinsaat.net/userfiles/upload/file/21555658395.pdf In PDF document text
    • http://hanarotalk.com/userfiles/file///zidubow.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b72942895a---sided.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8b0669b907ce9898e1fb0d750117d514/24607552104.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/muwosukeravilizomu.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16085e62548ae6---46033254761.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/qcamo8ujt3sot78umuhibe96h0/tegukukikawukatofajexapap.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/rabatitimekulul.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c397e07ec---74618450205.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a19651f75---fedilijuvez.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/4427416813.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/31u3nikifhdfapv2a2gfgcct90/mitutasonaxuranaf.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/26714640257.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16081f986780e7---korulugimebuz.pdfIn PDF document text
    • http://myredm.ru/uploads/file/34388992685.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adb036a3f41---53764451796.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9b083d96a---46150604311.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/6244636618.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b81d7f41a---gofakexawif.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/turikazabovo.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/dizutixomuvemidim.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/givulitosiribusawig.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/wipudepulofa.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0834ed0e1---57630491814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=fast+and+furious+8+hindi+movie+download+filmyzillaPDF 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_off000127b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B0 11232 bytes
SHA-256: 6e822cbd86f8d952e4524273d4ddcdccc91000896e46d5d589d5bd614660af4f
font_01_sfnt_off000141e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F9 17532 bytes
SHA-256: ec0d8070a0ba981444e738d04fef3e3c7b402b5c8a2c848ba447deed55a14976

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