Malicious PDF — malware analysis report

Static analysis result for SHA-256 258b6733bbba0828…

MALICIOUS

PDF

76.0 KB Created: 2021-09-05 01:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5b4c0619a8ae792b5d319b219fd08edc SHA-1: c7b89269691441de1b28becc9e679ae32880169f SHA-256: 258b6733bbba082832a220a48a9e25dd2a76320e5f2300701683bb41d4f01212
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm to phishing or malware distribution sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect users to malicious content, likely for credential harvesting or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=comparative+politics+today+a+theoretical+framework+pdf PDF link annotation
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c4546e4f14ba3bfd2e60c112519513fc/13516174365.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/42394537927.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d6e732282775646a6fe9be7d1e121cc6/pakuki.pdfIn PDF document text
    • https://emenu.hu/editor_up/sukezodalupadukizot.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/c6h76t778o5rhs1mvdhi8vdrt0/26471098659.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/86034613773.pdfIn PDF document text
    • http://belniig.by/public/file/rujatez.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/21076602992.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/92682303256.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/sabibirobowirenax.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/82488428222.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/romiwimudurarinugakugag.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/7842411678.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/67558749436.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ccav8pv0gq4bf6hhbht8uvmjvb/dulemisopatoje.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/62691528695.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/belididoresiwodozag.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/20548248789.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072effa3dbb7---tilomu.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/xakewudemosoz.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fdad4281f---3067316655.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/72272237288.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f36e09fec---koweretariritiwesikunaf.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de1dcb490b2---84267603491.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_off0000c2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AE 11168 bytes
SHA-256: 8ef528ca3f2fbf9c232325fcebb98842032dd04de87fd43f8706b70e43b3a949
font_01_sfnt_off0000dce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE6 17344 bytes
SHA-256: e6b0e9c0e2e91c30d573390ea2c87dc60d0c6c1d629536c14f38e306885406a7
font_02_sfnt_off0001096c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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