Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae518e6d1e183e4…

MALICIOUS

PDF

101.2 KB Created: 2021-09-16 20:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fda0cb4da402f1b966288a4e049223c1 SHA-1: d716875497a063ae0748161fe4adce36bc36e1c1 SHA-256: dae518e6d1e183e423b47806dcf502831afd03fe36a8ddf2122c1a6cadd9f602
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to a variety of websites, including those hosted on compromised WordPress installations and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms and UTM parameters suggests an attempt to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9682

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=earn+money+for+free+givvy PDF link annotation
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/40994589201.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/jijedomelelaji.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/58313412617.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141b772138d1---dobutuworededowanogako.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210916203823.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/24697341340.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-8/20210908024725510131.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/wamozekevote.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/wupukojinujeremopaka.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/feririkiv.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/56277398424.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a5516be6225e8fde02d88899d2e15785/gabogagikabezewazepewi.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62536194253.pdfIn PDF document text
    • http://baove24h.org/upload/files/nogetuxekaramofivodonofel.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/kabilijitatagarav.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/mewarabimisexijenokera.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/xepuv.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/bawaruwanabu.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/89218387309.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///12025419443.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/rojafad.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/53837616046.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/36671264487.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/xukaxiva.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/66715840626.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/62439808a84e9c2414d47c3729e6fc79/46653432399.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C89 17132 bytes
SHA-256: c11ad99d91bff9084c15a807638fcdf75d6b5494d9bbcc09f19e59b1871292b0
font_01_sfnt_off0001259a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259A 18644 bytes
SHA-256: 62c453f1750557f0eeba1ba1de84691cfef5de73838ab995e60044809840d599
font_02_sfnt_off00015590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15590 10408 bytes
SHA-256: 5c6918932f29fae263f76749da27e9801004ffc7a8b204e390cbfaa55956fc86
font_03_sfnt_off00016d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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