Malicious PDF — malware analysis report

Static analysis result for SHA-256 df0bb9ef88eba617…

MALICIOUS

PDF

91.9 KB Created: 2021-06-27 04:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c181e8cbbcc383c8860f05b37fcc45c SHA-1: 0236b67c05c8b68626f7de539ee44bd9ae5165fa SHA-256: df0bb9ef88eba617db768710d804850055227d381c79962d6bf5b39d782f5d12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://zkojicin.cz/userfiles/file/32797845384.pdf In PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094291d2ba2c---jezevowepo.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/xepezijomunodosavexobef.pdfIn PDF document text
    • http://ashioke.com/images/library/File/99377255598.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/94d2291f4b2baabe23c2d1643f53b025/mavadiwupirexogowudadezor.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721159b5429---zolepisolirigexedezapebog.pdfIn PDF document text
    • http://mega.kz/media/upload/files/60867474077.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/vopop1cgvu2voof31m7l3eroi4/74458046817.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed5d911de6---dekuwezavawi.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f5068137a---67712499194.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/fifip.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/33200473660.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a519fd2c377---jasijerawusotexedulad.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/64739444274.pdfIn PDF document text
    • https://coluer.ir/documents/file/65546495242.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210623_76D2576869369C11.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/9927675744.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/98kc16strbg39pabbs3locg052/77904039822.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/gupiz.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/d0d2ddc128cbd1ebbce0fe0cdd06850a.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/voaqbnp1l7pgc2g2c7hgjvgujh/gizezilofemaguxotok.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/6vqq2mk6qo6mk7ebah1amoq7j5/josabiniwibifobuwukonudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=wasp+sting+on+penisPDF 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_off00010323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 10276 bytes
SHA-256: 0781e74bbbbde69da9c758ba7264d116fae670870d74c163283e8b0636dfe370
font_01_sfnt_off00011a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6A 18452 bytes
SHA-256: 719e2758bcb84f1bae5ed4584ff54c0348170f603f3d0d249c6f415656984e98
font_02_sfnt_off00014ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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