Malicious PDF — malware analysis report

Static analysis result for SHA-256 991a10343ebf6993…

MALICIOUS

PDF

86.0 KB Created: 2021-06-28 11:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1e74d54a0486021c20c23d5e92d7da74 SHA-1: af6b8436ba1339b37e67c76ef79657aaf4238eed SHA-256: 991a10343ebf6993c4149d989d859e6c21eb80d417e91b4ef26817d1481db848
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/dddb32559846001e20ffa0e8d82c6655/javevipomamofon.pdf In PDF document text
    • http://pileshoppen.dk/userfiles/file/76046658089.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/mifunovepiwidosajupebo.pdfIn PDF document text
    • http://intergeored.com/upload/File/repoweguwekirin.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf6f6337c---rofejilit.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ob802ba6n5en5cg84hm097dmmp/35220485434.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/35744900703.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/cb2b45d04ad672952bddc9dd3220ecd8/patogujobupum.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c5ba0654e---wuvatakinofosaguxafibarib.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d48035b48---34211331106.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/kubiguxodibiba.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/a08c6deb55d26d94c9d0867c1502d8bc/zasesikuxuponupilexanubak.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/63471052501.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/40306757462.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608364e2b1424---70697275851.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/bilomurinezovikedajegawa.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6e352419b---64498874810.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/0f542d3ca5bac79f36e7ac04579431c2/dogozefovolodirawesokilan.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/lofimetezog.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/44816000569.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/77307298379.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/sorerukegixajurim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=differentiation+sums+with+solutions+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/eae91845f335dd90d11d1739bc066863/sabono.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 18976 bytes
SHA-256: f754627fb4673c047e8f33aaf6c823f115a191d89bea25608eef65b779123a16
font_01_sfnt_off000119e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F7 10948 bytes
SHA-256: 1a2d4e584fd8441fb96e9c8801c85b462cc7d085abb21955ac8b8a15c493c3f5

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