Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92fa07f719b4a18…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 07:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f2fbec9e1ff41977a9e132e90cb5897e SHA-1: df5223d9f8f1d4ec2361ef8b7cf00c9453074868 SHA-256: f92fa07f719b4a183ebfedcdc35f44ca6873810693ad3f36997d15136d34887d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the execution of malicious actions or redirects the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cometsecurity.in/admin/userfiles/file/xarejagoxitorenobogapinil.pdf In PDF document text
    • http://md-servicios.com/userfiles/file/gomikumimesoremamej.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc046990a3---16820811663.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/nujax.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/64292554554.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/81453247703.pdfIn PDF document text
    • http://poiskvod.ru/images/file/5943447292.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/47fd87b102a44ab4f824d1ee877ff9b3/76738469388.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1ad870a1c1---55593237249.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/54290054333.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/9e555e7d83f765e50497534e1590dc5c/71145576117.pdfIn PDF document text
    • https://signika.pl/Upload/file/16793768717.pdfIn PDF document text
    • http://ligneus.hu/upload/file/34173658872.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/69684119715.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/e9j0dih01gbocjmoq0oq5q23oj/gokavi.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0a074b167---duzobixumajevu.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160facdeb95e6d---nodozavod.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/68990546327.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210621_090D8CD19B77774D.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/dikipunikisafi.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/ecaa87f653e9ece809b2a9681925727d/60499537463.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1610aa8a176aae---30367052673.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/siruturarexekoxupad.pdfIn PDF document text
    • https://maria-galland.ru/files/file/10775515928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=irs+schedule+c+2017+pdfPDF 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_off0000df6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6C 16752 bytes
SHA-256: dd94ce799df9013e4b095af76ba327c1df898308999d2290098ded4fbab6dd6d
font_01_sfnt_off00010ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACE 10536 bytes
SHA-256: d0b07ff1113f8cdb2a68963ad9feb1612acaf05c45bbc4b196d7b7e6a3c0b856
font_02_sfnt_off0001230c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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