Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ead07dcac0111ea…

MALICIOUS

PDF

72.9 KB Created: 2021-09-07 20:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6ffac1504f5f0cd6d590e365ba218b22 SHA-1: ab934c040420bf91aba06491d241318cdb06766b SHA-256: 2ead07dcac0111ea03e8d23925f8fe4ab5951ce0fc48533c4087311ae4d43b2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, characteristic of link farms used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://basyapiemlak.com/yukleme_klasoru/userfiles/file/vipuv.pdf In PDF document text
    • https://siam-royal-view.ru/data/files/sogokutadojajovadumoxur.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/winokosogogoguvosumakat.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/kovabilisosefoj.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/polivijuzalewexujegik.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/votatakuzitapegufepo.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/gsq0ik55atp8mjjb8q3i84ssc0/negezifuk.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bc9c9e881---16162697413.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/offtdpmh1l7g2f7nr9rqvl10h7/tiguj.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/2vdv94olnp06pgdq2gfa6d9cca/53633614125.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/59466363604.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/magexunepisikufeduj.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/vugugu.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c139e8281ba---84879602730.pdfIn PDF document text
    • http://atrsara.ir/resource/files/pezomijidajomubodizikos.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9421c20c8---fazasotiw.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/94084124456.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/gamitemepewi.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/9684566384.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/41830528635.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/43257056706.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/a8a7824e86640c059ef37499fcfd9dbc/9982199118.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741cc620e5d---gaxujamaxixudotilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=parallelogram+coordinate+proof+worksheetPDF 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_off0000b9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F3 11244 bytes
SHA-256: eaf2421df267ec6f8bc0f6792f1d92d75cbc2fca065d7ea7ec58c58fc937d871
font_01_sfnt_off0000d3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F7 16284 bytes
SHA-256: d27e5e9e243f63f658b8ec691f70332020bfd2208f82af18a17cdb449281dcf0
font_02_sfnt_off0000fde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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