Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f44ca1933a9cde6…

MALICIOUS

PDF

88.0 KB Created: 2021-06-09 13:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 656a1f55a04fafabffc85042491afab2 SHA-1: 212157967d170584ed82dd0e505c9d03024b45e6 SHA-256: 7f44ca1933a9cde6ac4fcb2bcc5e7d4c424dad9598955dcc9a885e57a489f4b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan. It contains numerous links to external websites, many of which appear to be compromised WordPress installations, suggesting a link farm or distribution point for malicious content. The embedded URLs and the nature of the heuristics indicate a phishing attempt, likely to trick users into downloading further malicious payloads or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/uplcv?utm_term=top+notch+1a+third+edition+teacher+book+pdf+free+download PDF link annotation
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e3543e79a---pepujapoloxenus.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/puxopujupadaxegimisa.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607564292c429---77096021104.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3c4a43fca---dinukusutizisalofezipiz.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/26449315541.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/49602259586.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/neuajb5llbe6bc5r5ioklk37m7/33161441328.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/2f71c1954564eba2a7547847c9e6be95/40599271152.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fd7a48118---jakamotugatulupipadediwo.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210503050134157.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/27883343582.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7fd71f9c6f1db4fe12e39c869133a0a7/7736067826.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160be6d4ea7f0a---79060510782.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a1a564ac47a---60812818855.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/olr3o4ju1odm8jhe1ln33u97h3/23615552514.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000124fc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x124FC 24412 bytes
SHA-256: 8bd4c4396a4e4df6aa2bda25c17d851ffe6975e97e5bc8b296695d080e7a020d
font_00_sfnt_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 5364 bytes
SHA-256: 6d8abfbc6a41b2e97a312c22adfb6ebff5f5d733a82d88222cee0d3220bc94c6
font_01_sfnt_off0000fd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 12004 bytes
SHA-256: 1d5775fdda9a7d608ab159bbea397249bcb26e47b78d0b80aa8c25f3d87e7e79

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