Malicious PDF — malware analysis report

Static analysis result for SHA-256 9609168b4aaec56e…

MALICIOUS

PDF

90.5 KB Created: 2021-09-04 08:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a9ed0da4037fa9d1e08111fe15dcaf1f SHA-1: d1a4b78a3411a409e925658a541013a7dbd32d86 SHA-256: 9609168b4aaec56eab1d7be915219bedc5876d6868882628dc96dfd6e0cb6ecc
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 CMS uploads or disposable hosting, 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 0.9942

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://emmaushuis.org/pages/49314156572.pdf In PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/75580802071.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/dunod.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/mamukefala.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/of1i3cjjstbi0rvu03sjfjmrks/pifide.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/mpfpmrpf5nmsbplnjvur532322/tetisujoxemenim.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775b7b487be---64993289002.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1889223c19---xutivazejutu.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/17928268985.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a77b0b7c1e8---39046998148.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b543b55720070ca0c0717eaee0a09177/51417084626.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/miwavuvibowajiwejo.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/pukav.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/69303132912.pdfIn PDF document text
    • http://goref.ru/files/file/92230856669.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/23312816952.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/puzolowifofuvogeb.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607acd7a33237---71170726799.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/1338882604.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/resewatikuxi.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16117ea2037e74---womegusokek.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c40cfb60fb6---pakosaxapuwuxurepivemuze.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/919933786.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16120465756888---lixojatukuxanigakeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=joseph+campbell+the+hero%27s+journey+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_off0000fc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC74 11304 bytes
SHA-256: 94f0ed90fd09342077b8daa25af55392c2a5a9b5f949e7438384d662d5bf99a5
font_01_sfnt_off000116ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BA 17924 bytes
SHA-256: 4f789ee198edc7e613b4b4aff84c3da91fe764807eba982f27391c2fb1b21199
font_02_sfnt_off00014445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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