Malicious PDF — malware analysis report

Static analysis result for SHA-256 32fb38ff4aeffbbc…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 23:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fe0708d39f6dfaa2d49db2ebafca4b99 SHA-1: e051d866b306677b05aef0e941d2dd64675edd26 SHA-256: 32fb38ff4aeffbbc188e05273b8949bb0985d761cd6d252d2ebed21f8a097b22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various domains, many of which are identified as link farms on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://dtjxbpzx.com/filespath/files/20210911185912.pdf In PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/94136936186.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/81274826373.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/62396218931.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/30436273203.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/wikebasakamujaxumojo.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/7ccbd9ff2553947a0222916decf6b0eb/navijosisudek.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/39379297643.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/wixafozisewew.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zimatobudinazunabaviz.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/vidifexedinuvomat.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131f41d8cb11---xulakugan.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/rujegijasigokisoruwev.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/mudimumafididuse.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/98089442287.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131cd8f3ff77---nalesalurudadokibanu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b14d6661e---28576185072.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/rupiwobotidokufozavifasam.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/ladurakabururivukegavewu.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161360ec263a43---podubawawekobawepisira.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/dofarinogivudikonumim.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/2061229476.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/56672381265.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/91112028065.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/88057074004.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/puvilizop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=sign+in+network+android+systemPDF 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_off0000e3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AD 18248 bytes
SHA-256: d390fa1072652dc8f32e64a9cbfafe8a52d77ed6500d28c4a34ba203a4bef0d8
font_01_sfnt_off0001132d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132D 10912 bytes
SHA-256: 5d3e78bc6fc902e267d1dc31969f6fa8a0296edea761093f93d882366dc62021
font_02_sfnt_off00012c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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