Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5149f72068f0ecb…

MALICIOUS

PDF

86.4 KB Created: 2021-09-01 08:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5107ec4ec481c3a447412d4a46136f4 SHA-1: b7764c066cd28bf58fcdc6b15cea2d9e36094223 SHA-256: b5149f72068f0ecb2496d9ceba23881abb9f143c853d2a1e38ec8169a7312daa
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting an attempt to host malicious files. The presence of a 'download button' heuristic and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

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 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 http://geteffective.biz/uploadfiles/file/88623466211.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bee296576b7---potuvumuxa.pdf
    • http://hoangduy.vn/vn/files/nufixunoledobejidina.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747afb2c026---2484374998.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cd1e79e3fe1---26806124149.pdf
    • http://best-infosystems.com/userfiles/file/telojarolu.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611711a29ad3f---gujaluwoxek.pdf
    • http://fornacedelia.it/userfiles/files/90618575522.pdf
    • http://personnelstrategies.net/userfiles/file/42568826602.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609654ca29314---95857990025.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2c83210d6---xewesozef.pdf
    • https://tortugafilms.ca/adminfiles/file/13536716886.pdf
    • http://tsmsaldature.it/userfiles/files/luketifofuzaselovabizovok.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/54293a1931e90f5a658820ff557cae51/juguwerov.pdf
    • https://vandolderskb.com/images/usr/90871933576.pdf
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/77319616190.pdf
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/reviruvumudazoberoseliruw.pdf
    • https://argumentua.com/i/file/lafeguzujejatoboketixuzu.pdf
    • http://capmar.eu/userfiles/file/60304004737.pdf
    • https://sanaspinler.com/calisma2/files/uploads/gajudumukenote.pdf
    • https://drrajanmahtani.com/userfiles/files/80024730384.pdf
    • http://t-p-fortune.com/userfiles/file/sifiw.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3ae35b18e---90536959140.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ddd12b74e5e14be215e03fac07ff82d6/83779349187.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738d504ddbc---tifududazazutitebiso.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160986690edb2b---tazeliwukilifalurunoj.pdf
    • https://weddingitaly.jp/images/file/livuwo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=download+911+proxy+for+pc
    • 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_off0000e504.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE504 16792 bytes
font_01_sfnt_off0000fd1b.bin
886ec63647e9488dcd57dee5616711bf11ca7b52c4e7b8feeb0b947b104b86da
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1B 10644 bytes
font_02_sfnt_off000115b7.bin
cd90d4f299ad046f8e8f361aae57fb154555c53ecb7c3c1d41c42789e156ea73
pdf-font-stream PDF embedded font (sfnt) at offset 0x115B7 19572 bytes