Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b44ec45cea88a20…

MALICIOUS

PDF

92.7 KB Created: 2021-06-28 07:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1aadb1a66ea2a1b3b08d2fb7997a7b31 SHA-1: d8f92786331a39d33f5d0d0837932f85d8e01dd0 SHA-256: 9b44ec45cea88a202ce339d230fbd03c510cf43f24f8b68ea25939b8771de988
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to host or distribute further malicious content. The presence of numerous unknown URLs, many hosted on disposable domains or compromised CMS uploads, reinforces the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89c06b61a3---82550799098.pdf
    • https://warungmimpishio.com/contents//files/mawebizoxenevewesupiri.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d235c4b4e2e---ruragadagidem.pdf
    • https://auto-rujo.com/images-editor/file/46602611796.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083db7921b23---62843546171.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bf6d84d36---lumurepasizilu.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/08ccac0dd1f1a7e3aaa77945c78cd72f/warekomakubivipaw.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/1af8a337bd70585f5d7ad35f1c61b500/gofupiwivite.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a118159016c---rirelajozoza.pdf
    • http://www.bluewhaleline.com/image/upload/File/90099092161.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/3c06231d223c7ee6abeb006d54206d0e/vijafepuduravar.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c1dc34f81---zawilimuvasatukizax.pdf
    • http://detskaoptika.cz/ckfinder/userfiles/files/25688710622.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/16ee08d74617b3b7afc0928318245710/maranukutesupuvam.pdf
    • https://baohohoanglong.com/userfiles/file/34759746629.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/8988233260.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/5844cb4d479eb9199f6aee1ead8b8728/nixewuxifane.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d61032a1f---kibemulusebemedepik.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/ee69211080468ca0a6813b53efd5ef21/18957505645.pdf
    • http://davidhammerstein.org/userfiles/file/fawiruziw.pdf
    • http://instandee.com/Images_upload/files/nogirevebusorewo.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080a772abd76---19500162103.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/c2bfd262c2e35873f55f435b57cff426/61508442671.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b80d0752f---fikamulatar.pdf
    • http://bagliodeimille.it/userfiles/files/87659518050.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=highly+oversold+stocks
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010397.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10397 16792 bytes
font_01_sfnt_off00011ba9.bin
2b0c91d0c6401f3f0b3115cd635f924d148c18405ecfb26c98e5f6ebe0ff930e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA9 18364 bytes
font_02_sfnt_off00014bc8.bin
a3ae1a00f8ff1a59a178d5ba459250fcee3f3d71e2c12eea23f920ef29a0291a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC8 10644 bytes

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