Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd34f2670986f45…

MALICIOUS

PDF

97.6 KB Created: 2021-09-04 21:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6fb2d1c7a8e0bec55dc7920e2c0b8c09 SHA-1: e9d165c7bdcc0981ec7535a3db0edc0cd27b2b3e SHA-256: 3bd34f2670986f454593761db7413a1d945d969a181cc916a094d39c97a0817f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure suggests a link farm designed to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://agatanorek.com/files/file/xebanekaziwiranokopap.pdf In PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1bd5791df---wowogopagudi.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/tarudugerixidutosatiku.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607324f8bca2e---rowukusesisoxokazej.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/34018786766.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/11064000826.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/53571513121.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/wusekovozavu.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16089a26030e82---nonedetuzefolukiboporem.pdfIn PDF document text
    • http://allasclub.com/campannas/file/padijuxarip.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16090bf0d93bd9---18955945599.pdfIn PDF document text
    • http://irollee.com/userfiles/file/worunuja.pdfIn PDF document text
    • https://emmaushuis.org/pages/48792341821.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf436a552fb---leran.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/14249064238.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef6581ae48---wanalerovanu.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/26091340058.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609e003caf8dd---82530350678.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/35432534448.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/81801063888.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/38399269788.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c8e5e2cb5---10305451657.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3c818dc9ddb5a9d11a132c787a149f26/61929584225.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/wikita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=blackmagic+smartscope+manualPDF 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_off00011264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11264 19872 bytes
SHA-256: 8f9c42d5cfd8f010d7825e2f537d2c2a1806b074e1dd3b90d43c3bc3b17fc75e
font_01_sfnt_off00014775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14775 10964 bytes
SHA-256: 16aa2ac0615fdaa62da3dfadb31acd275f91198c49604d91835d01e496b84b2b
font_02_sfnt_off000160f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1