Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a25163e895e935e…

MALICIOUS

PDF

86.5 KB Created: 2021-09-02 04:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 165472350b3c7a55f1d6daca555be9cc SHA-1: 176523d7223e9d0ffbce89cd4897ddc8187ba590 SHA-256: 7a25163e895e935e385daf8d91c272130499884e244df3881d2cc45fe4f163d0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or redirection attempt. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://anmimar.com/royal/userfiles/file/kefonotozetopovidoliwow.pdf In PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/d554fdf5d3dde567cd89f1a2e91de684/26666496867.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f58fbf098b---98600601974.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9d266ac35---numonuwo.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/vezatulogudot.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/89gjiin62rql1cl4s5fif97ti6/28422470934.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/hd6f2m1vdnd9opp33bnvkhva59/89559334671.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/56599186108.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/25412413189.pdfIn PDF document text
    • https://mar3ol.com/Files/files/valuzexedekibamome.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/2308370292.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f68cbf40c---nokapijebavazozo.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5eaa2db0f---31940283615.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/sikezo.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee69ee3fa0---18818005454.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/gujovawaxode.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/gafazewisuxufosibog.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/81475089671.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/gumanubexibiw.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4b328df54---97928987508.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e5860bb4af2---saxezodagizawema.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/difofesugow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=example+of+poem+with+literary+devicesPDF link annotation
    • 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_off0000e8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EA 18616 bytes
SHA-256: fed791a1cb194a62a6948ee8d74d9ed6515fa95673dea64fb3189900c5073052
font_01_sfnt_off00011939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11939 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13150 11132 bytes
SHA-256: 1e0d68a84c29dc262ca73343884b7c1fc30b72781106578772ec15eb494de700

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