Malicious PDF — malware analysis report

Static analysis result for SHA-256 21912b5c323d41c8…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 05:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b670cf2addd3171303d190ce15962e9e SHA-1: e6879980bd007accfc3d89c7a660411f9b6ab16c SHA-256: 21912b5c323d41c87ece077f2069263366158b752f2055dc8fb7f4f5099701e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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 http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/p0ii1o8o4qcq81a0fnmfrrgdo1/8468112450.pdf In PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/noralor.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/73060429099.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/1migpvv1c6fu584f8o2lhv6tn7/bikonotoxamalav.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/6joudhdi25edrbun5b9vk1mbko/88888363112.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/kuwifulelero.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/28663744704.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e5d410ae6---76543253766.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9633bd903---wogusomewew.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/c7d52b1a96db8700077d7fbd438408bb/40142632699.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e34e7d558069233745473730030561eb/kusaritesaridaneberoxijo.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/debevoxunofalajew.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/galigozifetaxefivaloki.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/a6k3lu4q4qtu1hf3ftn0nj1ndp/gobarikokuxirim.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/fdqdk34tq3jfldrg2n76m4djk9/juzosamufasarixepogaka.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/bexuneg.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/8tfi36i173vjkarvnb4i0btqef/vevimodupixox.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/79744045892.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/gejamoken.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6cc2e9ef2a08c8c3d7cb4079a073bc76/53588931071.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0965657acb---pogujurulabamizexu.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9f8b5719ea44b8a699f01fcd89f82851/835886260.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/70958740004.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b48b86f7a---89312664423.pdfIn PDF document text
    • http://acril.ru/ufiles/files/nibabo.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/zokuregezupabiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=sixth+grade+math+worksheet+percentagesPDF link annotation
    • 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_off0000d6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D6 17936 bytes
SHA-256: 36a1e5cff4127e46d516524076b93cd0a3b10bf2c685c883642fca93940fa5e6
font_01_sfnt_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 11272 bytes
SHA-256: f7d2ce086703af01e7485e2d5219be1629f6cbc2b6e1410fff08eb3d624ca1dc

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