Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a6db7f213cf080…

MALICIOUS

PDF

88.0 KB Created: 2021-07-19 14:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 53eb31818d3774572b04aa7ece346758 SHA-1: f319e1250768f7bb42700e5778005e71a307bd30 SHA-256: e0a6db7f213cf080191c09be5048fdd06e147e36560d72d2c0e7acbcc57f2db5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing numerous links to external resources, many of which are hosted on compromised WordPress sites using the Formcraft plugin. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple distinct hosts and link farms suggests an attempt to distribute malicious content widely.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609374da491a2---wuxatobapapepanilemawuk.pdf In PDF document text
    • https://allcreaturesinc.com/files/files/fejilekuwimojasekone.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/pufizaxinememusur.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607754495015c---69108643458.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ec7aa6b4e---37359773736.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/25848101625.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/7a32e37990f16eb4e74760d75bc46a96/tovuba.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/58795919756.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/5733484356.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/h6hjatect813olh2tl1jj2tfr2/lugirejunetavitubutugim.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/84657399775.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/6f7a9026658190498b86d9bf39192485/tudiduso.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7e5de014c---52663918707.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/694135ffea99afcf3727dd98475f70d5/26998341703.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/tumijomapiworazu.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd5d43e8818143a47e444b9bcf0535c3/gimawag.pdfIn PDF document text
    • http://charivne.info/images/file/75182625770.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/39938913203.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1626620497.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/jubemol.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc00aa3d90---zewoxerujuriwakobejoxizi.pdfIn PDF document text
    • http://gospelinamerica.com/clients/874377/File/wowutalorawige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=free+gems+for+angry+birds+2PDF 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_off0000f656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF656 16768 bytes
SHA-256: c6b1e78666bb6ce7277430d5314e104e4baea3da4d9d29143fabeeca41ddde01
font_01_sfnt_off000121fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A12 10904 bytes
SHA-256: d29df196802f7481b75448742e5eb66e3c8709ee4983e7bec772513fb20bb4f2

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