Malicious PDF — malware analysis report

Static analysis result for SHA-256 589eacd83bd5d212…

MALICIOUS

PDF

119.8 KB Created: 2021-07-09 13:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cfc3a18b10a1bd9895da3f7d6cd9ec27 SHA-1: bbfd58f73db97035ead26e66022c0966cc0f507f SHA-256: 589eacd83bd5d2127d7da1b4770713ca604fa63d8381672e9d98b44abeabce0a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed a link farm structure within the PDF, with numerous URLs pointing to compromised WordPress sites. These links likely serve as a distribution mechanism for phishing or malware, aligning with the characteristics of a spearphishing attachment. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.2457

Heuristics 5

  • 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
  • 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://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160798a123508f---22704215547.pdf In PDF document text
    • http://conelser.hu/fck_uploads/file/kupapef.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/5837989650.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978a1889d8e---87817799645.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/eit3kkpu0qlclb3cco828auk24/bojukisejitexoko.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/fopugexexo.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/detutavim.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/68dp3a74k7rv3alrn2hpl6p7f2/kaxigereveko.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/6eguah9841mpbrfeaje3d4vei6/jobafu.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/e6dhpsjm6fvektrnsj1v04jcn2/rivugefof.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d28dd42ec7---tususopafusajavisovu.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/601ae1fbcf61a14b7bb77c644135e967/busudof.pdfIn PDF document text
    • http://daycamhoa.net/upload/UploadFiles/files/wawaluresojeromegop.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/45c467446fcd723fa5e06507f0220d03/96981856003.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/61365006e334251d9efad73c6bb2b7f2/14313309606.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/14778465486.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/73e126f99e1845f6ebc94a0f293da145/83261087769.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/pesonumedel.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5e5db28da---96310805252.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210618015157.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/varozenazage.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/6a782d7d5306f08d3252424ec37bd228/67517452261.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5c375bd13---xafobidokeg.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-29/20210629235554983086.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/55f534f0a5da05c2cb3f11cfb8a9b247/ruwidaxuxedake.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ff3172ff0---85465704401.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/46f6849ce5f6fb4a673a5ddf09208905/53743525398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=polystyrene+in+constructionPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A292 20064 bytes
SHA-256: db714c5a767ec292ebc7a69e3fdb5fdf3f735fdf3f74683308d963d115e572aa

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