Malicious PDF — malware analysis report

Static analysis result for SHA-256 30d7efc003b8e4ea…

MALICIOUS

PDF

89.5 KB Created: 2021-07-22 17:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9230899bc72e1056adc2273b80ce0b3a SHA-1: 0b1218261299efb162219476e15d1d96b2d7ea44 SHA-256: 30d7efc003b8e4ea49342fa74eb797b153860fe1fa3c8174ab3cf9286b96fd0a
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, some hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and link farm structure suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://mp-hd.de/data/aktualnosci_imgs/file/25792448473.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1251dc537---5549662494.pdf
    • http://hitecds.com/userfiles/file/93287266839.pdf
    • http://alexlunacoach.com/img/editor/file/roxuverolelevibinir.pdf
    • http://clasesholandes.com/userfiles/file/47088438787.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606df99d84247---vowipegufewutabu.pdf
    • http://ahkjt.com/upfile/file/80305086156.pdf
    • http://sbs-group.co/userfiles/files/mefoner.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ea2901bd6122fa80d41ae118a24779bb/lakipakukasusejufun.pdf
    • http://studiorestagno.eu/userfiles/files/40545420004.pdf
    • http://www.firengo.com/userfiles/files/16565534353.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a88ed157504---xawuvonuxemugabim.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/19df3bf737513020948a926d731114f4/suvenule.pdf
    • http://tscyw.net/userfiles/file/20210713045813_ra9ams.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc89edd599---pitalexosokubipol.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/e161cc033c1a2557a0cfbd5f245909a1/dowurexigoxadulukizoxise.pdf
    • http://land89.com/ckupload/files/fewazebixisowobibu.pdf
    • http://nedirajtebosnu.net/userfiles/file/30335994360.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9ec5bb24b---tetubovupajowuke.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6tg2vdn0t8uf40jbrefd1qd7s/robezib.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/1ecbce4963d3fd1beca48c781a7243d7/gomikazukawijujamu.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c99eb7905b---46075163298.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8c1f516545---6459752550.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fa824f134---razisisajusunirug.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+many+letters+in+the+hawaiian+alphabet+and+what+are+they
    • 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_off0000f230.bin
bdbe7c3ffd88c2e30bb3308d70ad164d3e214c6acadd97038935f7b97148cbaf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 10988 bytes
font_01_sfnt_off00010b3d.bin
63aff42f5086cfa42689c1d1417714716ace76ba419cd8d21f13209d03cef1cf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3D 20028 bytes
font_02_sfnt_off00013f35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F35 16792 bytes