Malicious PDF — malware analysis report

Static analysis result for SHA-256 531d194eb4da7837…

MALICIOUS

PDF

82.6 KB Created: 2021-09-05 04:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f4384b34d488772677a3b2538ee47e92 SHA-1: ba8d1c68881a262c0daee4cddd8ac83a7ce90169 SHA-256: 531d194eb4da7837cbce6a8da94c4fdbf5577eef2e0dbec3a43a1969741b5180
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a56e1267e---31341624856.pdf In PDF document text
    • https://shiokerbau1.com/contents//files/14265550462.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kokaluxokesexujinanofinuj.pdfIn PDF document text
    • http://daydala.com/userfiles/file/rewokotesebebal.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/milezagekejatuxirirup.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac920e8750---xitagamuronupuresa.pdfIn PDF document text
    • http://deforma.it/userfiles/files/17095126453.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/fadovewemisisiga.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/45070537436.pdfIn PDF document text
    • http://metallpress.ru/files/24979982390.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/miwebuxupoguruxuwetibegod.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e854a71be---gonibegok.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/jesib.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3326c3370b---sixinede.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/42iebishmmli5m5e1k43hqndk0/bapivimotupuwajezulobitod.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/53479547090.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/317d4a86a5d0c285eb817db00e24a4d4/fexipafutoxiku.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/25927363219.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a3f82f1a6---nulurulaliwimazaxojolumu.pdfIn PDF document text
    • https://studiorampinelli.com/file/62288344657.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62b49c4b76---33897479338.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/92302147708.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/25232988781.pdfIn PDF document text
    • http://chieucoingason.vn/files/28535746011.pdfIn PDF document text
    • http://novafish.it/userfiles/files/xubalodid.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e2eafc19---9956550595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=key+components+of+gis+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_off0000e1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 16700 bytes
SHA-256: 5e27628707931be9382a26da093b0972d8dc640ff39f87aa2d4c78cbbf188b94
font_01_sfnt_off00010c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4A 10760 bytes
SHA-256: 1692561b43b24cf45cad3c30dc6f0a06638333728b1e79fa9d8d70c63dab545a
font_02_sfnt_off000124dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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