Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e5082a76be4422…

MALICIOUS

PDF

84.9 KB Created: 2021-09-02 16:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 70467c919d834f9a97a2f6232000abcd SHA-1: 71e9a2392beaf3558e817d17ee074962db392cb1 SHA-256: 55e5082a76be4422af8ce8a70ca60e24cf3bc90a7a2fc412eed15194aea551d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Numerous external URLs were extracted, many pointing to compromised WordPress upload storage, suggesting a link farm designed to redirect users to malicious content. The PDF structure and the presence of multiple external links indicate an attempt to lead the user away from the document to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://pixomot.ru/uplcv?utm_term=difference+between+diabetes+type+1+and+2+pdf PDF link annotation
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f0dd7eba---46614417067.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082b451e45b0---56781211897.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/b28adca28bc83ce8be0de111ad18ebc5/wizeba.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/rekolewusuju.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad023e76987---xefeviw.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/868463569.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/rasokexudanajuvi.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/natalexopasakaxafir.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd20c49e65---93574862697.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/29847074013.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/wesigup.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/waxubujixuloder.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/17044237068.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a6ef47646---52520380767.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/tatuvabesabidadobenubi.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/79984338158.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/4b441a9ac2ec4a3a01336279b3955b50/5805671407.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/60137986313.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/cb55cc5e350647af5473f555feeb7dfc/97318390705.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/19577440020.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f45f07a8b---zozedopatajotugiwegafizom.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/53994607801.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/xegomuvitinifoza.pdfIn PDF document text
    • https://anfauglir.com/images/file/60132807769.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/798ggd1sogl7qpoacop63ikcn4/gugazefabilixasukigepubof.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/16907847444.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_off0000e72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72D 17140 bytes
SHA-256: 4cd2b3baf60151e0045d427a1c16bae5983627445023b87635f0a8496e099863
font_01_sfnt_off000113bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BD 10960 bytes
SHA-256: 14335b79e685ab16c5599fe77fe7704650bf4928338a19affcbaa911223f69b2
font_02_sfnt_off00012d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1