Malicious PDF — malware analysis report

Static analysis result for SHA-256 b923ecf45e9d49db…

MALICIOUS

PDF

90.7 KB Created: 2021-06-28 16:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 8e048293de2c72500007fa453ceee08c SHA-1: e726afcd9075c34003931336e5133192217eec35 SHA-256: b923ecf45e9d49dbcd0dc0824ef10334b9217099865bda9a250a60ddc474cc7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised CMS upload directories or disposable domains. The primary goal appears to be redirecting users to malicious content, likely for further exploitation or credential harvesting.

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.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/riik8k2pm7kdlnb3e9jnvdpcu1/zubakukimareterap.pdf In PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ip6khggpo6qv4qvbbrhaioron1/97422842481.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/baxetexejedufekogakudu.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5023acd63c2ef6b58da1a64087308749/92906336580.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/3a2d8b9197f6705a383749d71fe07924/15587558232.pdfIn PDF document text
    • http://allasclub.com/campannas/file/39884235081.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/livadojadizaf.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/cc8742490bf5e2959b7a6afc80d63734/tavosatogasulosinirapu.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/9ee56fb34a8a259e16413bb4fecc60de/47961101844.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/a5c0d626930f291ecc696a284c786207/wonudamabifitokulopab.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/qn442j1k34m4l7hsmsh5plepm5/94339478230.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/8qolns744i9kvdlhs5f8boidjh/waletewizurawatoris.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/f7bbce81673ba84fe058b0c002189773/lopovopasumirovukuvam.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a1b32aca6---94889568147.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/bajegipipud.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f0585359851ad49fd038a8b4d9f1af5b/98516335509.pdfIn PDF document text
    • https://htchninc.com/d/files/salokapufap.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/59d66104aa2d02017f32358d58b5e6f9/fegewagufidimirof.pdfIn PDF document text
    • http://beiks.info/public/file/bazaxisevebujuribi.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/jazalelet.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/3858e7cc50ebde96c6dbb425f7be0921/2305468124.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ede021ee47d56988dfca65cbe8755896/80873839127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=full+keel+bluewater+sailboatsPDF 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_off0001011b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11932 10392 bytes
SHA-256: b2776725cc87db0aded2035b33bf671b65481d3ee69dd0c92055f6ab8219faef
font_02_sfnt_off000130ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EE 17108 bytes
SHA-256: 670628242f6f54bf0f5b4796f8902d6e38b9478d2dddd3a2aa84fdf558f4a0d0

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