Malicious PDF — malware analysis report

Static analysis result for SHA-256 98728fa19c0e0425…

MALICIOUS

PDF

88.4 KB Created: 2021-07-05 23:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebf7a1df0683c3a6041bd9cd14823ba6 SHA-1: 2c6d9eb1a0067ebc5fa0a6dfc61d1e772d66913d SHA-256: 98728fa19c0e04254abd7b2a0bbc82537517fed6c44bb0a4c42825cfbf7351e4
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous external URLs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces the nature of the file as a malicious link aggregator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bosgo.mn/uploads/files/boxezonomijuwixu.pdf
    • https://telenovella-bg.com/files/52765100739.pdf
    • http://npas.ru/pic/file/14752150973.pdf
    • http://locnuocvietmy.com/Images_upload/files/83838520026.pdf
    • http://mhs69indians.com/clients/864804/File/fuganamajevidokasi.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7393821caa---nowilepubepunewe.pdf
    • https://realschoolspirit.net/scauserfiles/files/venubizonivu.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/alunpdnca51u2mfhg7r6mi5hv1/35213735997.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/qlaqj815rcfok244nuvbeger5h/jazevunader.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbd14a49c2---kuxoxereditiv.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea5fbe5e9a---jipoxunujipekavutaravi.pdf
    • http://eotp.info/sites/default/files/fck/file/godijozutizikededesavo.pdf
    • http://www.specemc.ru/upload/files/bawamegetosodukifemifeg.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/62576235708.pdf
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/15952474301.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e045d79435---61884709751.pdf
    • http://nuraski.pl/wsg/userfiles/vuzanipu.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/unloqlu3c0m0qhuroffeusrmeo/jatemexewiwalutimojem.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d705accc85c---dumopivotofazezorikazeri.pdf
    • http://urgentcarepb.net/userfiles/file/48416042381.pdf
    • http://dzbnf.com/upload/file///25037251747.pdf
    • https://advance-pack.com/editor_upload/file/5601292778.pdf
    • https://infiniteprospects.com/FCKeditor/file/toxesajopisusutog.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaeedc418b9---fapoto.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=moses+in+trouble+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_off0000f716.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF716 16792 bytes
font_01_sfnt_off00010f28.bin
90abe2f61a82d142fa96c56905221d398316c319dffa3f0cc9fa698ee1f6efc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F28 17500 bytes
font_02_sfnt_off00013c89.bin
a3990926120d934134cbe9dec091d0aae3cd530422b6ef36d45eaa4ebf54e535
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C89 10564 bytes