Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48e52de4db371ca…

MALICIOUS

PDF

100.0 KB Created: 2021-09-07 15:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fed9ae542272108eab1284015e1e590f SHA-1: 40d85ef775ba74f55f0d00d31e6eaddc0f9afb82 SHA-256: d48e52de4db371ca98a358f6547144af5420de990fe31685a02f01a4f2935075
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and link farm indicators supports the conclusion that this document is a lure to external malicious content.

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 http://wolfroccatiassociati.it/userfiles/files/48921813606.pdf In PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/9cebf68f736a16f02dc7eedad2ea09f4/92833887854.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/69894917012.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/89319631772.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/lanezapaman.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/72914473407.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/dipasajonudita.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/doxefitumewomuvej.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/58588122888.pdfIn PDF document text
    • http://zae.me/datafiles/file/sopago.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aac14f9309b---47839102855.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/c3sgh6se2o62nt40l2t2j9inv0/33911751995.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/i23u8qitldhhpp7hf3lq6cng4q/jatakifikiluware.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/jafariwisusoleposugofomol.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b57b5e3180e---faxofulegodunugapu.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/99813248135.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090aabeabebb---35172177318.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a721cec792---kunixa.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160751d6f53038---47331427524.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/2iqji6o34ftvkr486e54foh5d3/vozotojoxatodapufe.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/muxejivewutajewa.pdfIn PDF document text
    • http://lg-palette.com/upload/files/74743089435.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/kutiwazokile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=slavic+paganism+pdfPDF 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_off000117d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D2 22564 bytes
SHA-256: 6db772ebd63e185a83ff28ef26216335061d7f502939f81ed915daa11c8ebb9e
font_01_sfnt_off00015280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15280 10652 bytes
SHA-256: 1b2f088e4a849fe0dd8796778e7dc632863888c803a73a49bb6efd6c8847f860
font_02_sfnt_off00016aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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