Malicious PDF — malware analysis report

Static analysis result for SHA-256 21dfc53066367007…

MALICIOUS

PDF

89.5 KB Created: 2021-09-03 09:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 233c824a840354c58134fe7249e292e5 SHA-1: f308ebdca26f893747dc4a25def54befceafaa80 SHA-256: 21dfc53066367007d2b51fb80e0626e45c8c4b3aa585e1ce4ab599410002099f
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to distribute further malicious content or phish users. The presence of these links and the overall detection score point towards a phishing or malware distribution campaign.

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 http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/db3567ef6cf0ada135def60321d38933/15870453732.pdf In PDF document text
    • https://falconshipping-uae.com/userfiles/files/bimukariwu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/23edde47fe10a7edc8bb54cb1c3c2ad4/zabuxapekibu.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/dupuvije.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/fe03rf5mc2bu59p8r7d47v1d40/limibudolawofugi.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/80424737534.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/f559b630da6de89b15d0c8dc14a7d5ea/vofowizojuxivefi.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9beec59f7f856f4761a1fc9549553fe9/66551057577.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/42a5a0ee04b391c98cd47d35ef9faac7/2796519354.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210810192154.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/zelevokalel.pdfIn PDF document text
    • http://rnralpha.cz/res/file/5052407634.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/xikufotiduwuvasogetedikip.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/7135382883.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/72385835035.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/69967643789.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160afcf0712e83---kimixojovoredudinot.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021060903584460.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/pededekiwukopemixi.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/pukidaxitunise.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/88130760917.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210813_062320.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e543373aa---75163592689.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/rekosunitebisijaket.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/xulaguv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=manual+de+homiletica+samuel+vila+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_off0000fae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE5 17108 bytes
SHA-256: 05a4e5210efa1cdc1c14acf6e79f97c04b07c1deb3b401fb8490eaa1c0d558e6
font_01_sfnt_off00012753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12753 10944 bytes
SHA-256: 02c3ae9b92c1ac035ab48d9ec4c2d3ab7bbeb399e0ca2800790cbc3941651513
font_02_sfnt_off0001407a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1