Malicious PDF — malware analysis report

Static analysis result for SHA-256 561fe88f3fab35a7…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 08:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e1a12f6a26125bc4ab3521aef31287dc SHA-1: 00eb2d1e827d95d3531783faaba82992bb122e24 SHA-256: 561fe88f3fab35a7cb5d27b45941404d75e638eb5ab4b2e884d3c68bee94e94d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or phishing pages. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://servmed.net/userfiles/file/99012255007.pdf In PDF document text
    • https://tatsolarlight.com/uploads/files/50598056201.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/xixonilajirew.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/2nbfgla0kcpolnd7hi90q65im6/32306250995.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/39299045044.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbd55a12c6---91844741987.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608619532c338---xogaxem.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcc9e2a7f2---kujimuxulubanufu.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/lupilofuxikafidojadiwebus.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/56c9257d73bcbdbd5dd8871acc4878d2/gaduzadulusewatusojejuli.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/fosego.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ep7o5lmp23id1rjbftdtqfdd47/63998147959.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/bewunovaluwazaruzaginef.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d4e36d206---71655010419.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/wukixolawixosej.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/36192193680.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/81h0hlb8hq01uf8qdobo8lojv5/sinelefopagilofe.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c855cb120a---lagowevodudowasalexip.pdfIn PDF document text
    • http://uci.ir/userfiles/file/54786452479.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/70026560389.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084bbac46264---namib.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ba57b7761b6746afd687f90bee74c8e6/fiparugobevi.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1624813846.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/tixirijorot.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/ninarudavowojepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=gest%C3%A3o+de+riscos+com+controles+internos+marcos+assi+pdfPDF link annotation
    • 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_off0000d862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD862 11088 bytes
SHA-256: 9dcdc1a3391161a895cf4f6c72768866df121572a2bdacde8c97f689c7e2ecf5
font_01_sfnt_off0000f1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CB 18068 bytes
SHA-256: cca1d3234f787363e5e6f1f09b6524fd23849d511fe903355a80ca83c79938d7
font_02_sfnt_off00011e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1