Malicious PDF — malware analysis report

Static analysis result for SHA-256 5300236d184f3bec…

MALICIOUS

PDF

81.0 KB Created: 2021-06-28 09:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 472338ccd34863390ec3476bc53b90da SHA-1: e85058d97a40a22d92fc0b81e1c650da7b8b53b7 SHA-256: 5300236d184f3becc8ca0069c0e54cf28cd9cbb9c18802a2c9359e4d2e301edb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://aterhesseg.com/up_image/file/xunonofuzalepu.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/df34104f8fcce19c89b9866fffe3c3d3/dokuzetaxupejelerex.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609b58ee5ea16---34071952752.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072196d099dc---gotajedawob.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/rm4rfmh2lpvoutkc5jh5tpefg3/599902434.pdf
    • http://allaboutdowney.com/userimages/5162970866.pdf
    • https://aprilboya.com/userfiles/file/86109644555.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5edbad16de---nawajedifoxatefadivi.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c11cb3e1b---nudixujokemomerat.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb75432f3e---divetutofoji.pdf
    • http://flirdining.com/uploads/files/jizoxexif.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdf72c2919---37982018225.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/8cc3lcotibce157qq4qqbqlem6/lulenebulojidopoxilu.pdf
    • http://alarcon-v.com/editor_upload_image/file/32637374635.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ar08v7ifgtscftu1v2d2p12nq2/botaderepexowijidatoge.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d9e3d689cdf9898cd9bee0f2cd4c5ff/93227330732.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703a31497ea---30782859578.pdf
    • https://100tmt.com/uploadimage/files/20210620185005.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/50962231081.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/87202c27608c4278b2c88f02eb6638f8/donuwegadinezazi.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609025710e0ea---wewalizawapo.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d970110931b---6140267553.pdf
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707aa26b87b---44314366600.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/f2eeec5742b09da7e6464b08abd78b18/vogevufetekiwajesox.pdf
    • http://krakow4you.pl/krakow/files/lefugurufotafapasi.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/19a66e77b17cd88362cee4d6bea9046e/tolenewo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=advantages+and+disadvantages+of+foreign+aid+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0F 16792 bytes
font_01_sfnt_off0000f426.bin
397e3541f7e753751d3127456eb3a9310faae2a3a05e844e47bd6f8328a120fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 10676 bytes
font_02_sfnt_off00010c9d.bin
6a15c8cbe018e67ba2e1cfb8918cd984ae5a976fb0aa733d91822d632e16b898
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9D 16172 bytes