Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d2453facd8413f…

MALICIOUS

PDF

113.8 KB Created: 2021-09-04 12:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 889777045f039e83bd5303883f73d74d SHA-1: 451baf49468d650123fbf19d0b611b2ceeb845b2 SHA-256: 41d2453facd8413fd3864db5d3d0201d12bc6d8f5ce00f2a7c64bb957a6a7ffd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics suggest the PDF acts as a lure to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=abts+antioxidant+assay+pdf PDF link annotation
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1612e094910bd4---16579534292.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/96004067707.pdfIn PDF document text
    • https://cargotavio.ru/files/file/68707754674.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608060788d66d---zuvosusatawowe.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/84861750328.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/9e6e72d65f4de5aefe20e60a880b21bb/komugokujofe.pdfIn PDF document text
    • https://polandpools.com/contents//files/butadokise.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/7934046107.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/jezitami.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1cf0125c6---dobafaxiboruguboxuxu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087da01cc694---tiwobazojurarirapejo.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7b057ad31---mizurixigiduvowomof.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/sanewaxedadetufazuwowoz.pdfIn PDF document text
    • http://soupworld.de/upload/file/kowajejazi.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/bexinolipegedi.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/ledabaxevazademagob.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/65f10f37041a125a3030ad7de755e169/gebulilekapot.pdfIn PDF document text
    • http://vo23.ru/upload/file/virazunuvekewipukojige.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/66005141901.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/5903abb22de809783e04e6c4ef3120f5/pefaraxolewenomuw.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160777333a8be5---weborixubutelabusib.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/24770059631.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/f7713e356ecff57d450866af0bf9256c/5178249456.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/f4cfa49415fe933be23a1e9ba4329414/vobawukomogipawiwoxegan.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/jepejavudor.pdfIn PDF document text
    • 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_off000152c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C1 20764 bytes
SHA-256: 9400e9dfd6f31f6379c59e403042acde4113402ee982026cf1d10ce726773794
font_01_sfnt_off00018962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18962 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A179 10548 bytes
SHA-256: d6da6a0f9c6683eafe4339a56c774b722104f44c59bf07ab3a2d85fa2ca54542

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