Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11e36c166dd854d…

MALICIOUS

PDF

101.9 KB Created: 2021-07-03 10:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d434ed42af50d1209104f35822954c8e SHA-1: 159d8e5217762e7927a2500fe870fc3d2426a0b2 SHA-256: b11e36c166dd854dd365479531e94314acd933ae9d5817d2e937c1213ec21bf0
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://modra-skola.cz/userfiles/file/90837102847.pdf In PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609717d172fc1---goxot.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/a10eed6983a64b6373ec28691a62cdfa/49094570533.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/xibinoxafejimalimapepubuz.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a849ee0e191---80864251880.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/lk1e7rl35vuu5sakkf3jhjku53/36890542208.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/aa2f55b75f09e72988e425b13c53a5f8/66818095116.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ngvrsbsdu1csn0hhinkq1vp726/mivesis.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/9160755789.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63024c173ff424655f2c25f4ebc63d7a/rosokexubomexe.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/jijikep.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a03dfc5b675---kaxepogaxasumete.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f71651d5c---82219883217.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/70049553820.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/32519965026.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/39b039b9bf37f3c00df3bd3adeed690a/veritirukilaraguj.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607452eae2014---51753461505.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/945a8dc16553e8cbc4f98b78ae65dacf/93689969314.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/61756333970.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/fagos.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3780ae6879d1354909142922600caa7f/wifikejilavil.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/lenafepobizasesusez.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/romebaxilegelebatak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=list+of+exotic+fruits+and+vegetablesPDF 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

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_off00012a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A14 18280 bytes
SHA-256: eb67331c18f59beec9ef00d6000f92651fe7734967ba42f343336fcae8a90aac
font_01_sfnt_off00015897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15897 11016 bytes
SHA-256: c5d1fe0c9d381127ca40dbebe68dcaa186997e48c3ce6dacccb8049e5249b6ea
font_02_sfnt_off00017234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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