Malicious PDF — malware analysis report

Static analysis result for SHA-256 be61adbad578722e…

MALICIOUS

PDF

87.4 KB Created: 2021-08-31 19:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4c389861396428f642ceaca3654c4393 SHA-1: f23e5bcabb6e3a86a858de6e816a4d8323aa83ed SHA-256: be61adbad578722ebc8c95107ab5c0d86b77210be0982633f78cf50ba58a0361
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or phish users. The PDF structure itself does not contain readable content, but the presence of external links and the detection results strongly point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b2f72f9d43508545c4a6c2ed0e667f92/72231930083.pdf In PDF document text
    • https://banghenails.com/upload/file/ziguvax.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/jojegeraza.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/99788915836.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/kakuzoleboxixifodefu.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/91035475697.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54efef228---54345917128.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/i7e0sa5kcl50rb9s9rm4nuqfl8/72239163263.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/wemekemuxe.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a747110bbb0---mutiwivijogovoferudojeze.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/vozewa.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/bekavixigelinanixiza.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/35071360346.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e518f494ae---55937148508.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/9rjpk5tu42oh7681925bcs7hhj/36680767817.pdfIn PDF document text
    • http://zzliuxue.com/upfile/file///jotedibiguragopefum.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/bddf0603aa5d62f2bd3d569a7315e64e/67127604898.pdfIn PDF document text
    • https://egf.tw/test2/images/file/pisezilevizomazasatedazi.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/gexiwenejukebelipitorok.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/52077849408.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/dbaaa45e53b8f8b1a2fdcccd4e3e8e3e/kipuvagig.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/jivuk.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/97c389e9bccb8963f1094a11baf9af64/nulevudebimidolarezine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=simulink+low+pass+filter+examplePDF 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_off0000edef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 18056 bytes
SHA-256: 4fe88ec4d325730c16eea637df42540928b6fa1fa633bf65fcc4899b293d60fd
font_01_sfnt_off00011cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCE 10972 bytes
SHA-256: 059f63d2b26b1b317c6405d58e06e549e934a0da9c3557f13b58e370bed8cb0e
font_02_sfnt_off00013654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1