Malicious PDF — malware analysis report

Static analysis result for SHA-256 44e316daf7cb96c3…

MALICIOUS

PDF

91.6 KB Created: 2021-08-09 02:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 65874f83665225c89ac15f4480de383a SHA-1: 1803a8d9f159a1a508018d52bf34f86e92aa6268 SHA-256: 44e316daf7cb96c3636b7085a2e283c78fd06c3469a0b38ab3c953d5facfb55b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf88a76669---73226033021.pdf, are likely intended to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://giga-tronics.com/userfiles/files/kuselog.pdf In PDF document text
    • http://adimhukuk.com/resimler/files/52200273169.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/7r6h1qqmfnvss8jcunn1p97mcr/torugimidi.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/59824347561.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/konowi.pdfIn PDF document text
    • http://allasclub.com/campannas/file/88430329305.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833bfb6f58b---71991868765.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a627b0a4320---vemamageraruvemetegojul.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080f627a7c8b---69659556779.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1bc65240a---25268708579.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/32132020039.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/80440412258.pdfIn PDF document text
    • http://runo34.ru/attachments/file/jabomewizufaporibil.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8e142dd9e---zutebexuxutuz.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/68517131568.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/bewexotebem.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/5506836515.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/bujotusadinuzuxinu.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/29838877514.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/6f3f14d82b6a67ec892fcbae3ff8c11e/didota.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/zoxujafegepezog.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf88a76669---73226033021.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/2395786602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=verses+to+read+when+fasting+for+financial+breakthroughPDF 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_off000100cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E1 16740 bytes
SHA-256: 8407b38758f1ada8dff895a4b131d54bb67cd8697aa1f08d685f31fdf08fc16d
font_02_sfnt_off00014426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14426 11140 bytes
SHA-256: af42666a9e75216bc5fd41c807e1e0b56320d5a7eee330884160f3cf2f403750