Malicious PDF — malware analysis report

Static analysis result for SHA-256 7943bba4b5a499a7…

MALICIOUS

PDF

85.0 KB Created: 2021-07-07 17:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 6daf8fdb2ea3f3f98102bba65ad24c29 SHA-1: bd81cc82b10d9eec7eedbd9129f025b64ec121ae SHA-256: 7943bba4b5a499a7f266069f6ac9e02b77780c4ef1825e9a6c13d6d7bbeb00b2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites acting as hosting for other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of link farms on disposable or compromised hosting suggests an attempt to obscure the ultimate destination or leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/7de722fb766fa81ce991ad71d5ca2214/gazawepa.pdf In PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ag2cn2jgdbi9lo1fbr3cs01nv2/vazisasurojelokera.pdfIn PDF document text
    • http://innotack.com/userfiles/files/25549851950.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609cddfa170f2---bunuputavogux.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/38f5a40c46e2f9216f52b7d8fd8b7af0/2666641690.pdfIn PDF document text
    • http://aweibel.com/Photo/file/bowakutorokepigiku.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/3e1aeb9b7a38732aeb86023412afa29d/katavogabatogibuvusewitud.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/a824f8c4eb2b724d078921f7e6b7c814/fejopilopipes.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/favexo.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2107051153489267436m3tpy.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/rerusajitutomapeserinev.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607074d86ed31---7151243735.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/deec0de10d357bb57de53fded2fd5728/xiwobataba.pdfIn PDF document text
    • http://dogable.de/userfiles/file/99730364344.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/78275618829.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/tozutematizi.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/93664490707.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609670699a7ab---fukelisuz.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/70484859137.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/6923okdjrue8mdk9sja3r9n466/83536497241.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/cd265c7321ce88669400e6fecae89adf/lomotut.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/5tn7vnf152jefne6lq89shvk01/wubugelunipaza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+testimony+of+the+lordPDF 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_off0000eb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5B 10536 bytes
SHA-256: 2ae4d742fd1246c264555e92bdc389b18f97c1859b9ef26e4e07ff645872db31
font_01_sfnt_off00010329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10329 16800 bytes
SHA-256: bca751b11899cd73a0d2dee56f6db2fec9f369e3f1dfbdfbb790f284d152e158
font_02_sfnt_off00012ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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