Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc4c9c7630d5111…

MALICIOUS

PDF

87.8 KB Created: 2021-10-15 00:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c90ace79283c85c7a1ecfcaa85ad89a9 SHA-1: a201d25402f3953e11ec51dd5a1c44e253a21fa5 SHA-256: fbc4c9c7630d5111c4b38d8a15a6a2accd853f3e874c1bf4807284221b72b7ce
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

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://pmsp-me.com/userfiles/files/levalosakak.pdf In PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/74697539430.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/79801894089.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/79548320362.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/70730613769.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/zibixuruz.pdfIn PDF document text
    • http://rhondachem.com/d/files/10118807562.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/daziviwolev.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615748b3eb5db---2848289516.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/6772945346.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/juroxuji.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/56234111575.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/128421184.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/vevenujaforega.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/1477161191.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/pirakeximadurewasosi.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b39851829---60532796767.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/91809258954.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135b841d3dbb---52146915098.pdfIn PDF document text
    • http://xn--299a941ap1h.com/userfiles/file/20211005081100.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/53469712453.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/27960981270.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479ca3404fa---13251531241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/7xhmvLXWVJc/uplcv?utm_term=formula+of+acceleration+due+to+gravityPDF 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_off0000ef9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9F 10908 bytes
SHA-256: 95cf9a9369c5b04122a983c0e47e47901bfe37fa9b815c5442483584ca9cebe9
font_01_sfnt_off000108a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A0 18852 bytes
SHA-256: 11fa0da289e97d268e3686f1e0c26276a4e945b532ca65f0b421ff0a114c772d
font_02_sfnt_off0001397f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1