Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc1a27fcbaabdae…

MALICIOUS

PDF

85.3 KB Created: 2021-09-15 07:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 98005ab103d8f64065684147504d0372 SHA-1: b948d05825fadb86730d42457aaf234ca07d6e02 SHA-256: efc1a27fcbaabdae8a128fb594f763d03b2b6f04ec3a99285009b4cb25f0d3d2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. The document body is heavily obfuscated, but heuristics indicate it is a link farm and a callback phishing attempt. The presence of multiple external URIs, some hosted on compromised WordPress sites, suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cructi.ru/uplcv?utm_term=best+icon+packs+for+android PDF link annotation
    • http://arucax.am/user_images/file/63706356045.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/samiresaj.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161328ff88a66b---mutapon.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/9546687904.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16141121229cd2---gawenuruforot.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/7135942232.pdfIn PDF document text
    • https://csodamalom.hu/files/files/lakivabifapusotela.pdfIn PDF document text
    • https://beautydent.hu/editor_up/18821537881.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed4e51db8c---fomolafajaxupage.pdfIn PDF document text
    • http://vizcsap.hu/files/file/86758497996.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f1619f289ed7e07d3e5ed7b10d8d0881/35016869352.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210905163114.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/87577882048.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/divosoxug.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410df209ab2---sisumuxexipigeditaxe.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/140182336.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/c1e7714ce3dce804e67d6b8e533aeee0/kakomekabukoro.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/vusotuma.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1630869442193280961.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/86039205448.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/bopabivu.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/rg4jd3md4jlcmrjkf275a43sdv/fevaru.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/542ca7e53bf131b656b463b34a6e93e5/wabukanelinoku.pdfIn PDF document text
    • 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_off0000e62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3C 18868 bytes
SHA-256: b9ec4995d18b5060ba03cd4e658209157df61840d56bd292be52b2b85ae106ee
font_02_sfnt_off00012f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F01 10712 bytes
SHA-256: 72d53276d6ad3cc9d033082318b9385f08a0f7236c887ecd9e5437cb71de7948

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