Malicious PDF — malware analysis report

Static analysis result for SHA-256 67db37d17ed40974…

MALICIOUS

PDF

166.6 KB Created: 2021-07-09 10:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d6290c38f75e3b93ab81c4ec9c043e5 SHA-1: 65981d5016e1b03eabb5425c4c0f8dad59cac2f1 SHA-256: 67db37d17ed40974e8c43d6055f1711fab21de5adac5e15b61d10ef52d833b5b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9776

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://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160de8dcb42630---kovudupu.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/ffee2e6bd6c16ff5f95bc20e236fb8fd/saruxor.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d367b2284f8---rilozidapibafe.pdf
    • http://atthaya.com/file_media/file_image/file/rifitigejabuwisuje.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f85f4c30d4---pekerazibexebagel.pdf
    • http://technology-mp.it/userfiles/files/24587683845.pdf
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/95214633058.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826ea8c4511---wukutasajexujex.pdf
    • http://brlairport.com/images/file/futisibuwo.pdf
    • http://s-privod.ru/userfiles/file/61301550023.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ed6b02514---birelozusitukida.pdf
    • http://abc-tel.ru/data/File/walovedovojiruxuxewatizi.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78aceb8858---milin.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/r1plofgodheicgpr58pnunrio7/temivi.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f00cc8084d---xalibejodavabadofoseb.pdf
    • http://guoyangmoju.com/userfiles/files/wuzafejavaruvipav.pdf
    • http://ampletrekking.com/userfiles/file/63976555368.pdf
    • https://gites-les-bardots.com/userfiles/file/pizofuxuzawud.pdf
    • https://dcimx.com/files/relat.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/70b8452bb048ebb0677b0e5d6e96ef21/31817725402.pdf
    • http://kemenyseprosiklos.hu/upload/file/39696391405.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7271b685ff---90723524232.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e1db32c2caa81ef9839c777603f81872/64628586911.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=english+trails+student%27s+book+workbook+2
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021010.bin
976c28a1c8d3a8db819db49b97d1c6ae9e0cc77154d012c33b34c26cc2187f96
pdf-font-stream PDF embedded font (sfnt) at offset 0x21010 19684 bytes
font_01_sfnt_off0002426b.bin
97c674b19fa60e82815f856aa135b9fd84624ea2c64f270ecaaa5795712d8352
pdf-font-stream PDF embedded font (sfnt) at offset 0x2426B 16284 bytes
font_02_sfnt_off00025878.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x25878 16792 bytes
font_03_sfnt_off0002708f.bin
1a21e0128d8493ba189c3003823e7613fea42188c1d31caf130bc85973f2f16e
pdf-font-stream PDF embedded font (sfnt) at offset 0x2708F 11080 bytes