Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b53a66ef2ef351…

MALICIOUS

PDF

85.1 KB Created: 2021-09-17 03:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 977503ae78d48c5a06992822170583e5 SHA-1: 73134f151751c7da179f6f0a4926101fc3b813ac SHA-256: 19b53a66ef2ef351b3b02fdc618e2fac6c776ec829b115cb5c723280a17c85cc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs that point to compromised websites and potentially malicious files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are designed to lure users through search engines, and the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates the use of compromised WordPress sites for hosting. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=how+to+save+pdf+from+print PDF link annotation
    • https://artcorner-fiberglass.com/userfiles/files/zumil.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/18670625585.pdfIn PDF document text
    • http://fitviewer.biz/files/file/72149117486.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/72036294564.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/52b2f7b7b8dafa63347c4c9d5127e913/80453332066.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f3e564fb9---jeloxujuwokekumidepim.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/13308029959.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/89887694115.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/sonomevonujuz.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/93586308125.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431655b0fba---96767195303.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/40162207803.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/47677896702.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/95422150577.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/luxapumurakuf.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/dimamabuzamos.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/rafobenajatutinonibi.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/wipowubofivolugorupuj.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/45423216840.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/40287818662.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/jawusuguz.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/881bd4af13323170ea78f02b53ce494e/nejesiv.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/9a30025f5b1885448fa95557605e6180/pojupowulaxuzoger.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_off0000e840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE840 17612 bytes
SHA-256: ef2d69222bf45efa6f8fb7532f321af50775e1eff074b59b98e2212e4f44433d
font_01_sfnt_off00011621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E38 10756 bytes
SHA-256: 7275c81faf92ff7f7015d3a1b21cc2bbc93fa452f281d5acee3bfafc236ec0a0

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