Malicious PDF — malware analysis report

Static analysis result for SHA-256 11225a20ed728a6a…

MALICIOUS

PDF

87.4 KB Created: 2021-07-15 09:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc2ed74451ad1a221d6d5c4fc169ab9e SHA-1: ee80844fe0aa7beae8769e98f0be28ece6949cba SHA-256: 11225a20ed728a6a4f6cc97597efeea172326b2c16af67d0a1e965b0fa99b82a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to compromised websites, suggesting it is used to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a pattern of hosting malicious content on disposable or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e6bb2da5ee0---mizoxupikofedirirapow.pdf In PDF document text
    • http://placc.info/up_image/98998291627.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/3ca4b95fa3ad62002f18386021ae5058/rajotawidisot.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609017a7f10b7---mugudulula.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/5ldebjj6bfpl9lqe544mpc4u1j/buzedefotekegujopif.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/8011318916.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/f3033669313a0549994bade9c5d969c4/71462130796.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/tejigixog.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0b438470d---tugukatewiragerebasegubo.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607103b41b624---bawiw.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/ef7d1dbdf19bb37b6389543a7009c7ca/levoredujuxepekikotaxuk.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/44589550226.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/jujox.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/jenepaxe.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e6bc771521d---47697267250.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/b3dd76a29020fa8553368d812597b9bd/86719287622.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56dec3413b---sunasopimisevuxonipuxa.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/cv90796bj07h6qrgu1dsv3dqk4/nujujixilo.pdfIn PDF document text
    • http://jonme.net/ckupload/files/suvetopelifegajuwotu.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/bqkvudcokopr1bouel4s3frju2/xovupisirakigit.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/hp236g45cn3i7qc0i025l3a4j1/87056337300.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/kp4u0r6hm5dgc3qj2ebpd05s1g/kuwiwan.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/lexixogupuvopososuvananur.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/rapemumimigozomadijupufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=morigeau+lepine+crib+assembly+instructionsPDF 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_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 11064 bytes
SHA-256: fbf9e03432c870314468df267bd98186bc157f54b2ca54cce52d7e5f42acf635
font_01_sfnt_off00010af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12306 17320 bytes
SHA-256: 42616b3a0706e4af7e11369fe6019b0bd7ab447a16f194f345b683db7c5e1da2